how to access item in list of tuples? [closed]

empty list of tuple ,add tuple pairs(words and words meaning as pairs of tuple) from user input to list, user can not add words two times, if they do I have to print error msg that word is already added. and I have to be able to insert word and get the meaning on anther function. This what I try to do but it not giving me what I want. Help! Thank you!

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