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StephenG1CMZ · (This post was last modified: 11-01-2017 05:18 PM by StephenG1CMZ.)

Wow.

It's amazing what a couple of lines can accomplish when you are familiar with HP Prime built-in functions.

However, I think there is a bug:
{1,2} yields {1,2,0} rather than the expected {1,2}.

Your version doesn't handle {"red","green","red} - but then it is likely much faster as well as more concise.

My own version is mainly written in the style of a C or Pascal program trawling through the lists, with very limited use of built-in functions such as union (thanks for your #21 solution). As such it is likely slower, but perhaps more portable.

It is included in my new list processing API
http://www.hpmuseum.org/forum/thread-9411.html
But I could extract the relevant procedures here if you like.