# How to use provided functions `token_id` and `append_to_succs`

In this problem you have to use complicated functions that are given to you. 

::::{card} ⚡ Live programming
1. Examples with `token_id` and `append_to_succs` functions.

   Analyze the input and output before using them.
1. using the debugger in the development process, to stop after an implemented function.
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