d'f + (8d'a +aAdx+ fi + (84 d+4Ad +20r +2Dxr+E)y + (dx +Am+Fæ+0) — 0 
d(a — b) — (bs + ar) = A 
: 
do + D)d + (bs + ar) — 244 — 8 
BE 8 — à r — abd) + (br + as) — 2dF — 
a a +b)rs — 2ab(a—b) d+crs(p—g —1#+8) — 2(0—6)d = D 
k+ 2 da + b)(g r— ps) —ars (bp + ag°)(a +b)+ 2 d°abrs— 2 rs (bs + ar) + (D s — a° r)° + 2 ab (ar + bs)(as + br 
Ds — nr — 2 abd —h —F 
abære)(bs + ar) — (aps +bqr) = G 
A = d(s+r —p—q +lgr — ps), 
B— di — a(gs + pr)d" +(gs — pr}, 
FE — pr} + (g—s) +4paid +4(qr — ps) d+(ps—gr}, 
rs(pq —rsl(p+g) +rs(ps+qgr) + a2rs(ps +qr°) 
; 
pal rt) — 3pqrs(s+r) — pq(gs +pr)—(p# + gr) 
F—:{@py+rdd+gm—ps}, G—o. 
3 
cb+nr+rn]yr+fe+ser—p}(e—32p 
vi+[2x —at+ne+e—plp+f{(@—s—r np}. 
y + ax) — {ate+r r—ce+p ip +a)+érse = 0 
