proc plan might be too complicated (for me!), but what about:
data design;
do wear = 1 to 6;
do taskOrder = "1-2", "2-1";
do i = 1 to 5;
subject = rand("uniform");
output;
end;
end;
end;
drop i;
run;
proc rank data=design out=assign;
var subject;
run;
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