We extend the language of conditionals from the previous example by adding the keyword "else". This allows conditionals to ask two or more sequential questions, each with a different action. 

size(640, 360)
background(0)

for i in range(2, width - 2, 2):
    # If 'i' divides by 20 with no remainder
    if i % 20 == 0:
        stroke(255)
        line(i, 80, i, height / 2)
    # If 'i' divides by 10 with no remainder
    elif i % 10 == 0:
        stroke(153)
        line(i, 20, i, 180)
    # If neither of the above two conditions are met
    # then draw this line
    else:
        stroke(102)
        line(i, height / 2, i, height - 20)