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Theorem ri-cons-copy-new

# ax = # kx ⊦ ri-cons(ri, fs) ∧ kx.toSet ⊆ dom ri ∧ new(ax, fs) ∧ ¬ dups(kx) ∧ ¬ dups(ax) → ri-cons(ri[kx, ax], fs[ax, fs[ri[kx]]])

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