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- butfirst -- Operation, one input. Abbreviation: bf
- 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 first member re-
- moved. (If the input list has only one member, the output is the emp-
- ty list, a list of zero members.) If the input is a word, the output
- is a word equal to the input word with the first letter removed. (If
- the input is a single-letter word, the output is the empty word.) If
- the input is empty, an error results.
-