(makeset (tr (list 11
 1
)
(list "a" "a")
(list 22
 2
)
)
 (tr (list 22
 2
)
(list "c" "c")
(list 11
 3
)
)
 (tr (list 22
 2
)
(list "c" "c")
(list 33
 3
)
)
 (tr (list 33
 2
)
(list "b" "b")
(list 22
 4
)
)
 (tr (list 33
 3
)
(list "b" "b")
(list 22
 2
)
)
)