Paradigm Function Morphology

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Paradigm function: (like PF(L, σ) = III(II(I(Stem(L,σ)))))
    PF(L, σ) =
Rules of referral (like PF(L, σ:{ 3 sg pres indic }) = (Y, σ), where PF(<L, σ>) = <Y, τ> and τ = σ/{ 3 sg pres })
Stem operations (like Stem( BRJÓTA , S:{ past indic })=< brut , S>)
Rules of exponence (like I, XV[ V2 ], S:{ sg pres indic } → Xi )
Phonological classes (like vowel = a e i o u y )
Sandhi (like i Ø / _u, u_ )
Lexical entries (like Lexeme BRJÓTA Meaning break Category V Inflection class S2a )
Paradigm schemata (like Inflection class V-S2a { {1/2/3  sg/pl  pres/past   indic/subj} {1/2  pl  impv} }),
Show only queries for which we know the true results
Known truths (like GRÍPA:{indic pres sg 3} = grípur),