#! Returns a boolean indicating whether the input word is an empty word.
#!
#! Inputs: [INPUT_WORD]
#! Outputs: [is_empty_word, INPUT_WORD]
#!
#! - INPUT_WORD is the word whose emptiness is to be determined.
#! - is_empty_word is a boolean indicating whether INPUT_WORD is empty.
#!
#! Cycles: 11
export.is_empty_word
    repeat.4
        dup.3 eq.0
    end
    and and and
end