Question 4
Beaver-language words follow these printed rules:
- Use only the three symbols shown.
- Start with one symbol or two identical symbols.
- Add to the left and right of a word to form a new word.

Some example words are shown below.

Which of the following words does not occur in the language?

Editorial note: the last printed rule does not say which symbols or how many symbols must be added at each end. The conditional analysis below uses the same symbol at both ends, as suggested by the examples; the original wording alone is incomplete.
- Use only the three symbols shown.
- Start with one symbol or two identical symbols.
- Add to the left and right of a word to form a new word.

Some example words are shown below.

Which of the following words does not occur in the language?

Editorial note: the last printed rule does not say which symbols or how many symbols must be added at each end. The conditional analysis below uses the same symbol at both ends, as suggested by the examples; the original wording alone is incomplete.