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Consider the following program, written in JavaScript - like syntax: main program var x , y , z , function subl ( ) { var

Consider the following program, written in JavaScript-like syntax: main program var x, y, z, function subl(){ var a, x, z function sub2()[ var a, b, y: function sub3()| var a, y, w Given the following calling sequences and assuming that dynamic scoping is used, what variables are visible during execution of the last subprogram activated? Include with each visible variable the name of the unit where it is declared. "main calls sub1; subi calls sub3; sub3 calls sub2."

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