LetExp([
 VarDec(a,false,NONE,
  IntExp(12)),
 VarDec(b,false,NONE,
  IntExp(19)),
 VarDec(result,false,NONE,
  IfExp(
   OpExp(GtOp,
    IntExp(10),
    IntExp(20)),
   StringExp("10 > 20
"),
   StringExp("10 <= 20
")))],
 SeqExp[
  CallExp(print,[
   VarExp(
    SimpleVar(result))]),
  IfExp(
   OpExp(LtOp,
    VarExp(
     SimpleVar(a)),
    VarExp(
     SimpleVar(b))),
   CallExp(print,[
    StringExp("a < b
")]),
   CallExp(print,[
    StringExp("a >= b
")]))])