CURTIS S. 
BINARY FAMILIES IN A TRIPLY CONNECTED REGION. 
211 
3. 
4. 
Pa 
r 
Pa", Pb' * pb", pc' 
(Pa Pb pJ — 1) (<*i $ 
(Pa'pb'pc -1) K7 
(Pa'Pb'Po'-l)^ 
(pj Pb " pJ - 1) (ft 7 
Pc 
fill) 
«7i) 
a 8.) 
Pa 
I 
Pa", Pb' 
Pb", Pc' 
P 
II 
(pa'pb' Pc' — 1) OiS 
(Pa Pb pc - 1) («i 7 
(Pa' Pb Pc' ~ 1) (ft a 
(p«V»V-iK£i7 
a 
07,) 
7i) 
£*,) 
/>• /»V [^ (£«, - ft S) + C a (a x + (7 C ft)], 
Pa'pb"Pc' [ O c (a 8, - ft 7 ) 4- a C a (oj + C\ft)], 
Pa' />»' P</ Ca ft ft 
Pa pb" pc O a a ft. 
Pa'Pb'pJ [O e ifiB 1 - ft B) + /3C a ( ai + C,ft)], 
/>a'/>*'/>c' [C c (aS 1 -ft 7 )+aC 1 a (a 1 + C' c ft)] + ^(a, S - 7l ), 
Pa' P.' Pc' O a ft ft 
Pa' Pb' Pc' O a a ft + <? 6 (ftS 
0*,)- 
