Question

The Algol 60 Report contains the following syntax (translated into EBNF): primary = unsignedNumber | variable | "(" arithmeticExpression ")" | ... . factor = primary | factor "↑" primary. term = factor | term ("×" | "/" | "÷") factor. simpleArithmeticExpression = term | ("+" | "-") term | simpleArithmeticExpression ("+" | "-") term. arithmeticExpression = simpleArithmeticExpression | "IF" BooleanExpression "THEN" simpleArithmeticExpression "ELSE" arithmeticExpression. relationalOperator = "=" | "≠" | "≤" | "<" | "≥" | ">" . relation = arithmeticExpression relationalOperator arithmeticExpressi

Answer 1

-x ÷ y
a+b<c+d a+b<c∨d≠e∧¬f⊃g>h≡i×j=k↑l∨m-n+p≤q
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Answer 2

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Answer 3

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Answer 4

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