How to write script for coupled multiple time-series prediction using NN?

There are 3 time progression curves, coupled with unknown factors. It's needed to predict 3 numbers (short time one point is OK) at same time in order to preset the tools at predicted locations.

There are examples to code a script to predict one-curve-time-series using neural network.

How can we script code for this multiple coupled curves time series prediction using neural network?

Thanks.