<<< native [ EDelimited "[" ")" [ Right (EGrouped [ EIdentifier "a" , ESymbol Bin "+" , EIdentifier "b" ]) ] , EDelimited "{" "}" [ Right (EFraction NormalFrac (EIdentifier "a") (EIdentifier "b")) , Left "|" , Right (EFraction NormalFrac (EIdentifier "d") (EIdentifier "e")) , Right (ESymbol Pun ";") , Right (EIdentifier "a") , Right (ESymbol Bin "+") , Right (EIdentifier "b") , Right (ESymbol Bin "+") , Right (EIdentifier "a") , Right (ESymbol Bin "+") , Right (EIdentifier "b") ] ] >>> mml $$\left[a+b\right)\left\{\frac{a}{b}\right|\frac{d}{e};a+b+a+b\}$$