counter = 1
reverse = false
lines = 5

while lines > 0 do
    if reverse then
        for counter to 1 step -1 do
            print counter, " "
        endfor
        reverse = false
    else 
        for counter to 5 do
            print counter, " "
        endfor
        reverse = true
    endif 

    lines = lines - 1
endwhile