[EArray [AlignCenter,AlignCenter,AlignCenter] [[[ENumber "1"],[ESymbol Accent "\8594"],[ENumber "2"]],[[ESymbol Rel "\8595"],[EGrouped [EIdentifier "x",ESymbol Bin "+",EFraction NormalFrac (ENumber "2") (ESuper (EIdentifier "y") (ENumber "3"))]],[ESymbol Rel "\8595"]],[[ENumber "3"],[ESymbol Accent "\8594"],[ENumber "4"]]]]