[(Error (assertEqual (intersection (superpose (a b c d)) (superpose (c d e f))) (superpose (c d))) 
Expected: [c, d]
Got: []
Missed result: c)]
0.02user 0.00system 0:00.05elapsed 49%CPU (0avgtext+0avgdata 24552maxresident)k
24280inputs+0outputs (145major+2901minor)pagefaults 0swaps