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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def compose_item_handle(tokens):
 """Process function composition."""

    if len(tokens) < 1:
        raise CoconutInternalException("invalid function composition tokens", tokens)
    elif len(tokens) == 1:
        return tokens[0]
    else:
        return "_coconut_forward_compose(" + ", ".join(reversed(tokens)) + ")"