[EFraction NormalFrac (EGrouped [EPhantom (EIdentifier "a"),ENumber "12",EPhantom (EIdentifier "a")]) (ENumber "13"),ESymbol Rel "=",EFraction NormalFrac (ENumber "12") (EGrouped [EPhantom (EIdentifier "a"),ENumber "13",EPhantom (EIdentifier "a")])]
