xs1 = [
    x
    for x in range(10)
    if True
    ]

xs2 = {
    x
    for x in range(10)
    if True
    }

xs3 = {
    x: None
    for x in range(10)
    if True
    }

xs4 = (
    x
    for x in range(10)
    if True
    )
