PART 1: More-foul-logicalspelling Consider the FSTs (from Jurafsky Martin) reproduced below.

PART 1: More-foul-logical spelling

Consider the FSTs (from Jurafsky & Martin) reproduced below. Together, these two FSTs show how one can perform morphological inflection to express number (singular and plural) in nouns using an approach called two-level morphology.

The first FST is the level where the input has the form WORD+N+Pl, or WORD+N+Sg, where WORD is a noun (fox, cat, goose), +N represents that it is a noun, +Pl denotes plural, and +Sg denotes singular. The output of this FST is an intermediate form used in two-level morphology: the original word with a morpheme (or no visible morpheme) concatenated to it, but using only the canonical forms of the morphemes (i.e. without observing spelling rules or phonological rules).