Quiz generation makes redundant "Match" questions

[btbonval]

If there are only 4 key words, there's exactly one way to generate a "Match the words with their definitions."

However, in the quiz I generated which had four questions, two questions were "Match the words with their definitions" with the exact same four keywords. Although the two questions had a different ordering of key words, they were 100% redundant.

This is an edge case, but it would be good to avoid if we are able to avoid it.

[btbonval]

Quick answer:
create a quota for "Match the words with their definitions" which is N(keywords)/4. If there are four keywords, there can only be one "Match the words with their definitions". etc etc.

There's always some small probability that given two or more "Match the words with their definitions", randomly chosen key words will be the same. Putting a limit on how many "Match the words with their definitions" could help reduce how many chances that has to occur.