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parameter k1;
variable x,y1,y2;
ODEFunction y1'=3*k1*(y2/0.00005255-y1^3);
            y2'=k1*(y1^3-y2/0.00005255);
date;
0        13.21473193        0.026980462
5        13.14722611        0.071119005
10        12.95291375        0.095737123
15        12.85146853        0.111900533
20        12.83431235        0.118241563
25        12.81454545        0.118738899
30        12.80484848        0.119484902
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