Diamond Inheritance solutions

Diamond Inheritance was solved using Lisp by 6 contestants. Solution sizes: average 1694 bytes (shortest: 677; longest: 4010).

669.

lokedhs (S, L) (1149 B)
1585.

zeptokmeter (S, L) (677 B)
1852.

bertschi (S, L) (4010 B)
2326.

lpetru (S, L) (764 B)
2425.

m2ym (S) (1183 B)

2450.

Carlitos (S) (2437 B)