[ ESuper (EIdentifier "x") (ENumber "1")
, ESymbol Bin "+"
, ESuper (EIdentifier "x") (EIdentifier "a")
, ESymbol Bin "+"
, ESuper (EIdentifier "H") (EIdentifier "a")
, ESymbol Bin "+"
, ESuper (EIdentifier "H") (ENumber "1")
, ESymbol Bin "+"
, ESubsup (EIdentifier "x") (ENumber "1") (ENumber "2")
, ESymbol Bin "+"
, ESubsup (EIdentifier "x") (EIdentifier "a") (ENumber "2")
, ESymbol Bin "+"
, ESubsup (EIdentifier "x") (ENumber "1") (EIdentifier "x")
, ESymbol Bin "+"
, ESubsup (EIdentifier "x") (EIdentifier "a") (EIdentifier "x")
, ESymbol Bin "+"
, ESubsup (EIdentifier "H") (ENumber "1") (ENumber "2")
, ESymbol Bin "+"
, ESubsup (EIdentifier "H") (EIdentifier "a") (ENumber "2")
, ESymbol Bin "+"
, ESubsup (EIdentifier "H") (ENumber "1") (EIdentifier "x")
, ESymbol Bin "+"
, ESubsup (EIdentifier "H") (EIdentifier "a") (EIdentifier "x")
]