structures

function definition

defines a function

+ | function-name. functions are ended by the next new line

function-name / the name of the function

+ draw_window
fill gray
rect 10 10 110 110
# comment here does not break function definition
fill #6cbdd0
rect 20 20 40 40
rect 70 20 40 40
rect 20 70 40 40
rect 70 70 40 40

# call draw_window