key 4 and a
key 1 and a
key 3 and a
key 5 and b
key 2 and b

key 1 and a
key 4 and a
key 3 and a
key 5 and b
key 2 and b

key 3 and a
key 4 and a
key 1 and a
key 5 and b
key 2 and b