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The above formulation is not new; see for example Figure 3.7 of the classic ''The Design and Analysis of Computer Algorithms''.<ref name=AHU>{{citation|last1=Aho|first1=A.V.|author-link=Alfred Aho|last2=Hopcroft|first2=J.E.|author-link2=John Hopcroft|last3=Ullman|first3=J.D.|author-link3=Jeffrey Ullman|title=The Design and Analysis of Computer Algorithms|date=1974|publisher=Addison-Wesley|bibcode=1974daca.book.....A }}</ref> However, unlike the [[Pidgin code|pidgin]] [[ALGOL]] program in Figure 3.7, {{code|Q|apl}} is executable, and the partial order used in the sorting is an operand, the {{code|(×-)|apl}} the examples above.<ref name=APL1978/>
=== Dfns with operators and trains ===
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