SOLUCIÓN:
(pode haber outras...)

1
1 2 3 0 a b c
2
1 2 0 3 a b c
3
1 2 a 3 0 b c
4
1 2 a 3 b 0 c
5
1 2 a 0 b 3 c
6
1 0 a 2 b 3 c
7
0 1 a 2 b 3 c
8
a 1 0 2 b 3 c
9
a 1 b 2 0 3 c
10
a 1 b 2 c 3 0
11
a 1 b 2 c 0 3
12
a 1 b 0 c 2 3
13
a 0 b 1 c 2 3
14
a b 0 1 c 2 3
15
a b c 1 0 2 3
16
a b c 0 1 2 3

Resultarache ISTO moi sinxelo.