def METHOD_NAME(path_step: PathStep) -> str:
    """Interpret a path step for stack_positions."""
    # If no code, then no.
    if not path_step.code_idxs:
        return ""
    # If there's only one code element, this must be it.
    elif len(path_step.code_idxs) == 1:
        return "solo"
    # Check for whether first or last code element
    elif path_step.idx == min(path_step.code_idxs):
        return "start"
    elif path_step.idx == max(path_step.code_idxs):
        return "end"
    else:
        return ""  # NOTE: Empty string evaluates as falsy.