local q 0
local i=1
while !`q' & `i'<=20 {
	local j=1
	while !`q' & `j'<=20 {
		display "check `i',`j'"
		if el("a",`i',`j')==20 {
			display "found at `i',`j'"
			local q 1
		}
		local ++j
	}
	local ++i
}
if !`q' {
	display "not found"
}