theorem Th54: :: AOFA_000:54

( len ECIW-signature = 4 & dom ECIW-signature = Seg 4 & ECIW-signature . 1 = 0 & ECIW-signature . 2 = 2 & ECIW-signature . 3 = 3 & ECIW-signature . 4 = 2 )