Mapping and Filtering Help for Lists

[Zethex]

Alright I got asked today by a friend this question, which obviously I
couldn't help him with.

He needs to get rid of words in a string referring to an already given list
then needs to map them using a function he already has.  Ill explain this
better by giving an example :P

Say ur given these lists:

un_words =  ['a', 'the', 'he', 'she', 'uses', 'with']
alterns =   [ ['book', 'textbook', 'notepad'], ['pencil', 'pen', 'pacer'] ]

The problem asks to create a "compareandremove" so that you can use it on a
string, to remove the words from the string that are contained in un_words.

The remaining words then need to be compared to the alterns list and either
bring back the word if no matches or bring back the list.  To better explain
that i'll use an example.

If i do   compareandremove('notepad a pencil with desk')

I need it so it removes words contained in un_words, so "a" and "with";
then compares the remaining words to alterns to find a match.

This should bring back:

['notepad', 'book', 'textbook', 'pencil', 'pen', 'pacer', 'desk']


Any tips on how to create this function or maybe the function itself so I
can then show him how to do it.

Thank you.


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