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Proof step 3 from proof validfieldinits-def-01 (
previous step
)
⊦ validfieldinits(str, fv ' + fis, st) ↔ is_fskey(fv .1) ∧ validval(str, fv .2, fv .1 .fs .type, st) ∧ type∃(str, fv .1 .fs .type) ∧ validfieldinits(str, fis, st)
Lemma
validfieldinits-rec