strings st1, st2, st3
numbers n1, n2, n3, n4
let st1 = "eheh1"
let n1 = 1
let st2 = "eheh1"
incr n1
? "SE_ENGINE DEMO " + date + " " + left(time, 5)
? "start: " + str(timer)
n3 = timer
if 2+2=4 then
   for n2=1 to 3
      ? str(n1)
      incr n1
   next
elseif "2"="4" then
   ? "i shouldn't be here..."
else
   ? "oops"
end if
n4 = timer
? "end  : " + str(n4)
? "dif  : " + str(n4 - n3)
? str(prglines) + " lines of code"