On grammatical class:

ce'u
pseudo-quantifier binding a variable within an abstraction that represents an open place.
bo'a
pro-sumti: definitional terbri variable 1; x1
bo'e
pro-sumti: definitional terbri variable 2; x2
bo'i
pro-sumti: definitional terbri variable 3; x3
bo'o
pro-sumti: definitional terbri variable 4; x4
bo'u
pro-sumti: definitional terbri variable 5; x5