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##APL 21 20##
Takes screen input via ←⎕
(×/(+/t÷2)-0,t←⎕)*.5
##APL 21##21 20##
(×/(.5×++/tt÷2)-0,t←⎕)*.5
##APL 21##
(×/(.5×+/t)-0,t←⎕)*.5
