add_range t i j add all the numbers between i and j (inclusive) to the set. Note that it doesn't matter which order i and j are specified in, the effect is the same.
add_range t i j
i
j
add t i add i to the set
add t i
mem t i test whether i is a member of the set
mem t i
ranges t return a list of all ranges that make up the set
ranges t
max t the biggest number in the set (if it exists)
max t
min t the smallest number in the set (if it exists)
min t