Abstract
ThemAlgol productions of Algol are of the formXp0 ::=Xp1Xp2 ...X pn p , where 1≦p≦mAlgol, 1≦np,Xp0 is a defined type andXpj, 1≦j≦np is either a defined type or a basic symbol or possiblye, representing the empty string ifnp=1 [1]. A partial ordering of that subset of Algol's basic symbols and defined types which for somep are eitherXp0 orXp1 is exhibited. This ordering is of interest in implementing the syntax-oriented translator described by Ingerman.
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