111109
Tenta
1: b
2: d
3: ad
4: bc
5: abc(d)
6: a
7: acd
8: b
9: bcd
10: abcd
11:d
12: (a)cd
13: a(b)c
14: bc
15: c
16: d
17: b
18: ab
19: a
20: a(bc)d
21: a
22: abc
23: c
24: acd
25: abcd
26: a
27: c(d)
28: b
29: d
30: (a)bc
31: c
32: a
33: abc
34: abc
35: abc
36: c
37: b
38: c
39: a
40: ab(d)