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- butlast --Operation, one input. Abbreviation: bl
- The input may be any non-empty Logo object. If the input is a list,
- the output is a list equal to the input list with the last member re-
- moved. (If the input list has only one member, the output is the _e_m_p_-
- _t_y _l_i_s_t, a list of zero members.) If the input is a word, the output
- is a word equal to the input word with the last letter removed. (If
- the input is a single-letter word, the output is the _e_m_p_t_y _w_o_r_d.) If
- the input is empty, an error results.
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