Produce a function that: passed two arrays (or array refs) returns an AoA containing all possible sequences of the two input arrays according to the "random pick - values in sequence" specified in the OP.

Rules: Strict + warnings. Array contents can be anything.

Entries that take longer than an hour to run for input arrays of 100 10 elements (184756 sequences) each are disqualified:)

See thospel's post for the reason for the rule change. It's still an interesting problem to solve, even without golfing it.

Examine what is said, not who speaks.
"Efficiency is intelligent laziness." -David Dunham
"Think for yourself!" - Abigail
"Memory, processor, disk in that order on the hardware side. Algorithm, algorithm, algorithm on the code side." - tachyon

In reply to Re: (Golf challenge) (to cover my embarassment!) by BrowserUk
in thread Stable mixing of 2 arrays into a 3rd by BrowserUk

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