{"group":{"id":1,"name":"Community","lockable":false,"created_at":"2012-01-18T18:02:15.000Z","updated_at":"2025-12-14T01:33:56.000Z","description":"Problems submitted by members of the MATLAB Central community.","is_default":true,"created_by":161519,"badge_id":null,"featured":false,"trending":false,"solution_count_in_trending_period":0,"trending_last_calculated":"2025-12-14T00:00:00.000Z","image_id":null,"published":true,"community_created":false,"status_id":2,"is_default_group_for_player":false,"deleted_by":null,"deleted_at":null,"restored_by":null,"restored_at":null,"description_opc":null,"description_html":null,"published_at":null},"problems":[{"id":985,"title":"Make a Star Pyramid","description":"Create a star pyramid. First line will have 1 star, second will have two stars and so on... a basic program which is easily done in c programming.\r\n\r\nExample\r\n\r\n n = 3\r\n p = pyramid(n)\r\n\r\nreturns this string matrix in p\r\n\r\n '*  '\r\n '** '\r\n '***'\r\n\r\nThe output p is an n-by-n string matrix with spaces (ASCII=32) in the blank spots and '*' as shown. ","description_html":"\u003cp\u003eCreate a star pyramid. First line will have 1 star, second will have two stars and so on... a basic program which is easily done in c programming.\u003c/p\u003e\u003cp\u003eExample\u003c/p\u003e\u003cpre\u003e n = 3\r\n p = pyramid(n)\u003c/pre\u003e\u003cp\u003ereturns this string matrix in p\u003c/p\u003e\u003cpre\u003e '*  '\r\n '** '\r\n '***'\u003c/pre\u003e\u003cp\u003eThe output p is an n-by-n string matrix with spaces (ASCII=32) in the blank spots and '*' as shown.\u003c/p\u003e","function_template":"function p = pyramid(n)\r\n  p = '*';\r\nend","test_suite":"%%\r\nn = 2;\r\np = ['* ';'**'];\r\nassert(isequal(pyramid(n),p));\r\n\r\n%%\r\nn = 3;\r\np = ['*  ';'** ';'***'];\r\nassert(isequal(pyramid(n),p));\r\n\r\n%%\r\nn = 4;\r\np = ['*   ';'**  ';'*** ';'****'];\r\nassert(isequal(pyramid(n),p));\r\n\r\n%%\r\nn = 10;\r\np = ['*         ';\r\n     '**        ';\r\n     '***       ';\r\n     '****      ';\r\n     '*****     ';\r\n     '******    ';\r\n     '*******   ';\r\n     '********  ';\r\n     '********* ';\r\n     '**********'];\r\nassert(isequal(pyramid(n),p));\r\n","published":true,"deleted":false,"likes_count":3,"comments_count":1,"created_by":7262,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":219,"test_suite_updated_at":"2012-10-12T14:45:22.000Z","rescore_all_solutions":false,"group_id":18,"created_at":"2012-10-10T08:06:01.000Z","updated_at":"2026-03-31T18:12:10.000Z","published_at":"2012-10-10T08:08:21.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eCreate a star pyramid. First line will have 1 star, second will have two stars and so on... a basic program which is easily done in c programming.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eExample\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[ n = 3\\n p = pyramid(n)]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003ereturns this string matrix in p\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[ '*  '\\n '** '\\n '***']]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThe output p is an n-by-n string matrix with spaces (ASCII=32) in the blank spots and '*' as shown.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"},{"id":45369,"title":"Sky full of stars - 02","description":"draw an isosceles triangle with asterisks of size n. For example, for n=6\r\n   \r\n    '     *     '\r\n    '    ***    '\r\n    '   *****   '\r\n    '  *******  '\r\n    ' ********* '\r\n    '***********'\r\n\r\nThere can be two types -- top(t) or bottom(b).\r\n\r\nPrevious problem \r\n\r\n\u003chttps://www.mathworks.com/matlabcentral/cody/problems/45368-sky-full-of-stars-01\u003e","description_html":"\u003cp\u003edraw an isosceles triangle with asterisks of size n. For example, for n=6\u003c/p\u003e\u003cpre\u003e    '     *     '\r\n    '    ***    '\r\n    '   *****   '\r\n    '  *******  '\r\n    ' ********* '\r\n    '***********'\u003c/pre\u003e\u003cp\u003eThere can be two types -- top(t) or bottom(b).\u003c/p\u003e\u003cp\u003ePrevious problem\u003c/p\u003e\u003cp\u003e\u003ca href = \"https://www.mathworks.com/matlabcentral/cody/problems/45368-sky-full-of-stars-01\"\u003ehttps://www.mathworks.com/matlabcentral/cody/problems/45368-sky-full-of-stars-01\u003c/a\u003e\u003c/p\u003e","function_template":"function y = star_pattern_2(n,s)\r\n  y = x;\r\nend","test_suite":"%%\r\na= ['*********'\r\n    ' ******* '\r\n    '  *****  '\r\n    '   ***   '\r\n    '    *    '];\r\nassert(isequal(star_pattern_2(5,'t'),a))\r\n\r\n%%\r\na= ['         *         '\r\n    '        ***        '\r\n    '       *****       '\r\n    '      *******      '\r\n    '     *********     '\r\n    '    ***********    '\r\n    '   *************   '\r\n    '  ***************  '\r\n    ' ***************** '\r\n    '*******************'];\r\nassert(isequal(star_pattern_2(10,'b'),a))\r\n\r\n%%\r\na= ['*************************'\r\n    ' *********************** '\r\n    '  *********************  '\r\n    '   *******************   '\r\n    '    *****************    '\r\n    '     ***************     '\r\n    '      *************      '\r\n    '       ***********       '\r\n    '        *********        '\r\n    '         *******         '\r\n    '          *****          '\r\n    '           ***           '\r\n    '            *            '];\r\nassert(isequal(star_pattern_2(13,'t'),a))\r\n\r\n%%\r\na= ['*'];\r\nassert(isequal(star_pattern_2(1,'t'),a))\r\n\r\n","published":true,"deleted":false,"likes_count":2,"comments_count":0,"created_by":363598,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":26,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2020-03-16T20:30:49.000Z","updated_at":"2026-03-22T01:39:50.000Z","published_at":"2020-03-16T20:30:49.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003edraw an isosceles triangle with asterisks of size n. For example, for n=6\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[    '     *     '\\n    '    ***    '\\n    '   *****   '\\n    '  *******  '\\n    ' ********* '\\n    '***********']]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThere can be two types -- top(t) or bottom(b).\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003ePrevious problem\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:hyperlink w:docLocation=\\\"https://www.mathworks.com/matlabcentral/cody/problems/45368-sky-full-of-stars-01\\\"\u003e\u003cw:r\u003e\u003cw:t\u003e\u0026lt;https://www.mathworks.com/matlabcentral/cody/problems/45368-sky-full-of-stars-01\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e\u0026gt;\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"}],"problem_search":{"errors":[],"problems":[{"id":985,"title":"Make a Star Pyramid","description":"Create a star pyramid. First line will have 1 star, second will have two stars and so on... a basic program which is easily done in c programming.\r\n\r\nExample\r\n\r\n n = 3\r\n p = pyramid(n)\r\n\r\nreturns this string matrix in p\r\n\r\n '*  '\r\n '** '\r\n '***'\r\n\r\nThe output p is an n-by-n string matrix with spaces (ASCII=32) in the blank spots and '*' as shown. ","description_html":"\u003cp\u003eCreate a star pyramid. First line will have 1 star, second will have two stars and so on... a basic program which is easily done in c programming.\u003c/p\u003e\u003cp\u003eExample\u003c/p\u003e\u003cpre\u003e n = 3\r\n p = pyramid(n)\u003c/pre\u003e\u003cp\u003ereturns this string matrix in p\u003c/p\u003e\u003cpre\u003e '*  '\r\n '** '\r\n '***'\u003c/pre\u003e\u003cp\u003eThe output p is an n-by-n string matrix with spaces (ASCII=32) in the blank spots and '*' as shown.\u003c/p\u003e","function_template":"function p = pyramid(n)\r\n  p = '*';\r\nend","test_suite":"%%\r\nn = 2;\r\np = ['* ';'**'];\r\nassert(isequal(pyramid(n),p));\r\n\r\n%%\r\nn = 3;\r\np = ['*  ';'** ';'***'];\r\nassert(isequal(pyramid(n),p));\r\n\r\n%%\r\nn = 4;\r\np = ['*   ';'**  ';'*** ';'****'];\r\nassert(isequal(pyramid(n),p));\r\n\r\n%%\r\nn = 10;\r\np = ['*         ';\r\n     '**        ';\r\n     '***       ';\r\n     '****      ';\r\n     '*****     ';\r\n     '******    ';\r\n     '*******   ';\r\n     '********  ';\r\n     '********* ';\r\n     '**********'];\r\nassert(isequal(pyramid(n),p));\r\n","published":true,"deleted":false,"likes_count":3,"comments_count":1,"created_by":7262,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":219,"test_suite_updated_at":"2012-10-12T14:45:22.000Z","rescore_all_solutions":false,"group_id":18,"created_at":"2012-10-10T08:06:01.000Z","updated_at":"2026-03-31T18:12:10.000Z","published_at":"2012-10-10T08:08:21.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eCreate a star pyramid. First line will have 1 star, second will have two stars and so on... a basic program which is easily done in c programming.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eExample\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[ n = 3\\n p = pyramid(n)]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003ereturns this string matrix in p\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[ '*  '\\n '** '\\n '***']]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThe output p is an n-by-n string matrix with spaces (ASCII=32) in the blank spots and '*' as shown.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"},{"id":45369,"title":"Sky full of stars - 02","description":"draw an isosceles triangle with asterisks of size n. For example, for n=6\r\n   \r\n    '     *     '\r\n    '    ***    '\r\n    '   *****   '\r\n    '  *******  '\r\n    ' ********* '\r\n    '***********'\r\n\r\nThere can be two types -- top(t) or bottom(b).\r\n\r\nPrevious problem \r\n\r\n\u003chttps://www.mathworks.com/matlabcentral/cody/problems/45368-sky-full-of-stars-01\u003e","description_html":"\u003cp\u003edraw an isosceles triangle with asterisks of size n. For example, for n=6\u003c/p\u003e\u003cpre\u003e    '     *     '\r\n    '    ***    '\r\n    '   *****   '\r\n    '  *******  '\r\n    ' ********* '\r\n    '***********'\u003c/pre\u003e\u003cp\u003eThere can be two types -- top(t) or bottom(b).\u003c/p\u003e\u003cp\u003ePrevious problem\u003c/p\u003e\u003cp\u003e\u003ca href = \"https://www.mathworks.com/matlabcentral/cody/problems/45368-sky-full-of-stars-01\"\u003ehttps://www.mathworks.com/matlabcentral/cody/problems/45368-sky-full-of-stars-01\u003c/a\u003e\u003c/p\u003e","function_template":"function y = star_pattern_2(n,s)\r\n  y = x;\r\nend","test_suite":"%%\r\na= ['*********'\r\n    ' ******* '\r\n    '  *****  '\r\n    '   ***   '\r\n    '    *    '];\r\nassert(isequal(star_pattern_2(5,'t'),a))\r\n\r\n%%\r\na= ['         *         '\r\n    '        ***        '\r\n    '       *****       '\r\n    '      *******      '\r\n    '     *********     '\r\n    '    ***********    '\r\n    '   *************   '\r\n    '  ***************  '\r\n    ' ***************** '\r\n    '*******************'];\r\nassert(isequal(star_pattern_2(10,'b'),a))\r\n\r\n%%\r\na= ['*************************'\r\n    ' *********************** '\r\n    '  *********************  '\r\n    '   *******************   '\r\n    '    *****************    '\r\n    '     ***************     '\r\n    '      *************      '\r\n    '       ***********       '\r\n    '        *********        '\r\n    '         *******         '\r\n    '          *****          '\r\n    '           ***           '\r\n    '            *            '];\r\nassert(isequal(star_pattern_2(13,'t'),a))\r\n\r\n%%\r\na= ['*'];\r\nassert(isequal(star_pattern_2(1,'t'),a))\r\n\r\n","published":true,"deleted":false,"likes_count":2,"comments_count":0,"created_by":363598,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":26,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2020-03-16T20:30:49.000Z","updated_at":"2026-03-22T01:39:50.000Z","published_at":"2020-03-16T20:30:49.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003edraw an isosceles triangle with asterisks of size n. 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