?- can_build_word("A").
true.
?- can_build_word("BARK").
true.
?- can_build_word("BOOK").
false.
?- can_build_word("TREAT").
true.
?- can_build_word("COMMON").
false.
?- can_build_word("SQUAD").
true.
?- can_build_word("CONFUSE").
true.