('.IIAPITIIE IM. SUIl LKS (lliOUPES I)'()lil)U 1", 2'. ?if) 
pondant sont 
0 = (i, 2, 3, 4) (5, 6, 7, 8) (9, 10, II, 12) (i3, i/|, i5, 16) 
x(i7, 18, 19, 20) (21, 23, 23, 24) (20, 26, 27, 28) (29, 3o, 3i, 39.), 
/y = ( I , 9, i3) (2, 1 4, 10, 6) (3, 7, II, i5) (4, 16, 12, 8) 
X ( 17, 21. 2.5, 29) (18, 3o, 26, 22 ) ( 19, 23, 27, 3 1) (20, 32, 28, 24), 
c-= (i, 17, 3, 19) (2, 20, 4, i8) (5, 21, 7, 23) (6, 24, 8, 22) 
X (9. 20, II, 27) (10, 28, 12, 26) (i3, 2g, i5, 3i) ( i4, 32, iG, 3o). 
Voici les faisceaux 
F,= ;a, S-, 0;, i^",— ; /y, 0, c, F;,-- ;a/A o|, 
= ; ac, ?j, 0 I , F;; = j abc, Sr, f) ; . 
37. /■. Le groupe 
{a^ — ?j, b- ~ c- — = i , ab = ba^S, ac — ca, bc — cb) 
a 28 opérations d'ordre 4 et 3 d'ordre 2. 
Le groupe associé, d'ordre 4, est engendré par les isonior- 
pliismes 
a— {b, bd) {ab, abi\) {bc, bd)) {abc, abcO) 
X b?!0){ab?!, ab^fi) {bc^, bc?!ù) {abc^, abc'bi)), 
1)= (rt, «9) abn) {ac, ac%) {abc, abcQ) 
X {a?!, a'bù) {ab?j, ab'b^s) {ac'p , ac'bi)) {abc'ii , abc'^d). 
T^es substitutions génératrices du groupe régulier corres- 
pondant sont 
a= (i, 2, 3, 4) (5, 6, 7, 8) (9, 10, II, 12) (i3, 1 4. i5, i6) 
X (17, 18, 19, 20) (21, 22, 23, 24)(25, 26, 27, 28)(29, 3o, 3i, 32), 
h= (i, 5, 9, i3) (2, i4, 10, 6) (3, 7, 1 1, 10) (4, 16, 12, 8) 
X (17, 21, 2D, 29) (18, 3o. 26, 22) (19, 23, 27, 3i) (20, 32, 28, 24), 
c= (i, 17^ II, 27) (2, 18, 12, 28)(3, 19, 9, 2.5) (4, 20, 10,26) 
X (5, 21, i5, 3i) (6, 22, 16, 32) (7, 23, i3, 29) (8, 24, 14, 3o). 
^ oici les faisceaux 
F, = f, 0;, F2.-=;6, c-;, V-i—\ab,c\. 
