1 (2005) 368378a of 989. It is to be by as et 3 N r 2005 +H. 1. of of of of by 985, y 1 of as a of et 2 is a in to a in a in to of a In 3is a 1. a at of by is of of to a In a to on is An if it be to to 005 100 d, 1609, 4 004; in 004; 0 004Y. of a at 4a be as 5 s on to ys is q*, at a is to be is gi(as 1)as : To be be a ; i 1;2; .; n, (1)n is of q z0;y0;f0;of of q y N Y. 1 (2005) 368378 369(2)of as by q. (3). be if q. (2) to :9=; 6. (3). If is is at of is by If is at be of a be to 6a be to Z O X Y Z O (x0,y0,1. to N of is no on to a to is by it is as to is to If is is of a to or A to of a is of is to of L:As 3, n; i 1;2; .; n; n be as : : : :2637et 7 to a to It et 8 an to of L( of to of It X of r of as (4) (5) (6)l is an of 6 6 6 46 Y. 1 (2005) 368378370WL: : : :7) n 6; is is n be of n n of to N Y. 1 (2005) 368378 371n n of n to of is to be to on of in n a s 2. Y (a1,b1,2,b2,(x1,y1,(x2,y2,(ai,bi,(xi,yi,(3. A N V X 0. (9) q. (9). an a of 0;0;0;3;0;00;1;1;0;0;00;1;1be be C0 is nd (8) 9) V0. 10(10) q. (11) is 0. (11)(11) r: In to an 1, 0, 0, 0, 0, 0, is is x 0 in of is of is by a is if of X be as of 90j: by 1, 1, 0nd . s) r n of If a n C0 r 0 r; 1r of s) to r : : : : : : :be as X (8)e y;Dz;ax;ay;x, y, z x, y, z of w is by of r Y. 1 (2005) 368378i 1;2; :; .N 0, 0, 10, 2, 1, 00,0, 1, 00, 3, 0, 20,0, 1, 00, 1, 0, 2is 01 3 :s 1;2; :;6l 1;2; :;6 () 6C0 r on a C+ to In a a is on a as 4. of as : 0, 0, 10, 1, 3, 00,2: 0, 0, 10,3,3,00,: V is a q. (11). r be 66637776663777:l 1;2; :;6 is of q. (10) a 101;0 j 1;2; :;6C0 r; 2. C2 n of to a r C2 r a 6C0 r r; 1r of s) to r C2 r :26663777H. Y. 1 (2005) 368378 373010N of 0 0000:50:5 00:51:50:75 5 1:50 00:25 0:25 0 00:5 0000000:5 is as a of of ve A of is of be 0; 0; 0; 0; 0x on an to of 4. Y. 1 (2005) 3683783745 a of in as 1: 0, 1, 00, 896, ,0, 1, 00, 1060, ,0, 1, 00, 1010, , 977, , 977, , 1034, of 1 0 515:000:896001 0378: 1:06000 1 0 612:00:01000:9955 349 0:0880 445 664 0:86380:9955 349 0:0880 728 664 0:82800:0880 0:0170 960 866:6257998 :2466 0:093626666666643777777775,o6 is It is of ve of 1is L; N 10378:001:06000 1 0 612: :01000:9955 349 0:0880 445 664 0:86380:9955 349 0:0880 728 664 0:82800:0880 0:0170 96 866:6257998 :2466 0:of :8768 607 665 21:3716 0:49953:0551 551 448 32:4448 0956 1:0862 12:0648 764 916044 0:0044 0:0061 061 00:0025 025 0:0065 069 0:0007004 0:0004 0:0284 284 is on ve is as 5. 10 (H. Y. 1 (2005) 368378 375:0551 551 448 32:4448 0956 1:0862 12:0648 764 916044 0:0044 0:0061 061 00:0025 025 0:0065 069 0:0007004 0:0004 0:0284 284 o ve to ,1:876860766521:37160:499526666666643777777775551 551 448 32:4448 0956 1:0862 12:0648 764 916044 0:0044 0:0061 061 00:0025 025 0:0065 069 0:0007004 0:0004 0:0284 284 02666666664377777