function to multiplex array of arrays
npm install @vr1/array-multiplex@vr1/array-multiplex, mulptiplexes array of arrays.
``
const src = [[1], [2, 3, 4], [4, 5], 6];
const result = multiplex(src);
// [[1,2,4,6], [1,2,5,6], [1,3,4,6], [1,3,5,6], [1,4,4,6], [1,4,5,6]]
``