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G.f.（t^49+2*t^48+2*t ^47+2*t ^46+2*t^45+2*t1^44+2*t^43+2*t^42+
2*t^41+2*t^40+2*t439+2*t38+2*t337+2*t36+2*t35+2*t34+
2*t^33+2*t^32+2*t=31+2*t|30+2*t*29+2*t`28+2*t` 27+2*t'26+
2*t^25+2*t^24+2*t*23+2*t|22+2*t$21+2*t`20+2*t` 19+2*t''18+
2*t^17+2*t^16+2*t*15+2*t=14+2*t#13+2*t=12+2*t_11+2*t|10+
2*t^9+2*t^8+2*t|7+2*t*6+2*t$5+2*t_4+2*t_3+2*t_2+2*t+
1） /（820*t^49-40*t^48-40*t ^47-40*ts ^46-40*th ^45-40*st ^44-40*tt ^43
-40*t^42-40*t^41-40*t|40-40*t*t^39-40*t$38-40*t#37-40*t=36-
40*t^35-40*t^34-40*t|33-40*t*32-40*t$31-40*t#30-40*t#29-
40*t^28-40*t^27-40*t|26-40*t*25-40*t`24-40*t` 23-40*t'22-
40*t^21-40*t^20-40*t*19-40*t*18-40*t*17-40*t=16-40*t=15-
40*t^14-40*t^13-40*t|12-40*t`11-40*t` 10-40*t*9-40*t'8-
40*t^7-40*t*6-40*t ^5-40*t ^4-40*t ^3-40*t^2-40*t1）
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