21.test

<<< native
[ ESub (EIdentifier "e") (ENumber "1")
, ESymbol Rel "="
, ESuper (EIdentifier "b") (ENumber "2")
, ESymbol Bin "+"
, ESuper (EIdentifier "c") (ENumber "22")
]
>>> tex
e_{1} = b^{2} + c^{22}