data test1;
set test;
x= strip(x1)||strip(x2)||strip(x3)||strip(x4)||strip(x5)||strip(x6)||strip(x7)||strip(x8)||strip(x9)||strip(x10)||strip(x11)||strip(x12)||strip(x13)||strip(x14)||strip(x15)||strip(x16)||strip(x17)||strip(x18)||strip(x19)||strip(x20);
if count ( x,"a")>0 then new_x=1;
run;