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f=lambda A,*x:A and[[v]+u[[v]+u for v in A[0]forA for u in x and f(A[1:]*x)]or[[]]or[[]]]
Try it online!Try it online!
1 byte thx to ovs.
Look Ma! No itertools!
itertools
f=lambda A:A and[[v]+u for v in A[0]for u in f(A[1:])]or[[]]
Try it online!
f=lambda A,*x:[[v]+u for v in A for u in x and f(*x)or[[]]]
