x=10                          		// number assignment
y=20
factor=2
what="hello world"            		// string assignment

size=x/factor                 		// assignment with binop
text what x y size            		// text "hello world" 10 20 5

y-=10                         		// assignment operation			
size+=factor                  		// assignment op, substitute
text what x y size            		// text "hello world" 10 10 7

for v=0 100 5                 		// loop from 0 to 100 by 5
	line 100 v 0 v 0.1 "blue" 		// blue horizontal lines
	line v 100 v 0 0.1 "red"  		// red vertical lines
efor