[{echo 20 range (20, 40)}] [{echo 40 range (20, 40)}] [{echo 41 range (20, 40)}]
[1] [1] []
[{echo 20 between (20, 40)}] [{echo 30 between (20, 40)}]
[] [1]
[{echo 'm' range ('a', 'z')}]
[1]
[{echo 50 not range (20, 40)}]