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for (i=0;iatoms_num;i=i+2)
        {
                for (a=0;a<3;a++)
                {
                        do{               
                                u1=(real)rand()/RAND_MAX;
                                u2=(real)rand()/RAND_MAX;
                                v1=2.0*u1-1.0;
                                v2=2.0*u2-1.0;
                                s=v1*v1+v2*v2;
                        }while(s>=1.0);
                        r=-2.0*log(s)/s;
                        work->wx[a]=v1*sqrt(r);
                        work->wx[i+1][a]=v2*sqrt(r);
                }
        }
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