I don't understand the task. I'm already having problems understanding what the input numbers are supposed to represent.

1
2 2
2
1

what is the 1? 1x1 ? what is 2 2 = 2x2? what's the deal with modulo? don't understand this wild calculation

but it gets even crazier

1
6 4
2 1 3 1 4
4 1 2

what are 2 1 3 1 4 and 4 1 2 supposed to be anyway?