1 2 3 4 5 6 A M B (M) A A B B M M M M+A+B M+A (M+A+B) A,B,M 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 n x m (x) (n) (m) = x/(nm) 26 27 28 • • • • 2 coordination before doing coordination by doing • • • 29 2 • • 1 • Ax x A= A A’ 1 2 A A 30 31 32 ( 33 J A J A J A 34 • • • • • • • 35