Question: Help for racket Write a structurally recursive function (list-index s los) that takes two arguments, a symbol and a list of symbols. list-index returns the

Help for racket

Write a structurally recursive function (list-index s los) that takes two arguments, a symbol and a list of symbols. list-index returns the 0-based first occurrence of s in los. If s does not occur in the list, it returns -1. For example:

 > (list-index 'd '(a b c d e f d)) 3

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