- 11.3 - C13 Ce , C1 2 12 (6.15-12) Combining equations (6.15-1) through (6.15-12) by repeated substitution gives C C - - K 2 C K e C1 C3 - K2 C2 e (6.16-1) (6.16-2) (6.16-i) (6.16-12) Cl C 1 i Ci - e- K i-I Cl I C 3 - K12 Ce 12 K i K* i j=l I (6.17) where