21.test

<<< tex
e_ 1 = b^ 2 + c^ {22}

>>> native
[ ESub (EIdentifier "e") (ENumber "1")
, ESymbol Rel "="
, ESuper (EIdentifier "b") (ENumber "2")
, ESymbol Bin "+"
, ESuper (EIdentifier "c") (ENumber "22")
]