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1. By substituting `n_var` with its initializer, `0 < n_var` is equivalent to `argc > argi + n_trail`. 2. As `argi` is non-negative, so `argi + n_trail >= n_trail`, and the above expression is equivalent to `argc > n_trail`. 3. Therefore, `f_last` is always false, and `last_hash` is no longer used.