love the "unique" command!
Do not cheat yourself,OK?
I added additional cases to the test suite, so this attempted solution is incorrect now.
Replicate elements in vectors
Generate a vector like 1,2,2,3,3,3,4,4,4,4
03 - Matrix Variables 4
Square a Number
Figurate number triangle
Increment a number, given its digits
Maintain shape of logical-index mask
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