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Theorem prepost-decode-lpt

# buf = lptsize(# lpt, LEB_SIZE), buf0 = buf, lpt0 = lpt ⊦ ⟪persistence_io_decode_lpt#(buf; lpt, err)⟫ ((err = ESUCCESS ∨ ⌊err⌋ ) ∧ # buf = # buf0 ∧ (err = ESUCCESS → is-encoded(lpt, buf) ∧ # lpt = # lpt0))

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