<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def isolate(obj):
 """Feed a standard semantic object in and receive a simple list of lemmata """

        answers = []
        for token in obj:
            lemmata = token[1]
            for pair in lemmata:
                answers.append(pair[0])
        return answers