Singular

LIB "arr.lib";
ring R = 0,x(1..10),dp;
arrBraid(7);
==> _[1]=x(1)-x(2)
==> _[2]=x(1)-x(3)
==> _[3]=x(1)-x(4)
==> _[4]=x(1)-x(5)
==> _[5]=x(1)-x(6)
==> _[6]=x(1)-x(7)
==> _[7]=x(2)-x(3)
==> _[8]=x(2)-x(4)
==> _[9]=x(2)-x(5)
==> _[10]=x(2)-x(6)
==> _[11]=x(2)-x(7)
==> _[12]=x(3)-x(4)
==> _[13]=x(3)-x(5)
==> _[14]=x(3)-x(6)
==> _[15]=x(3)-x(7)
==> _[16]=x(4)-x(5)
==> _[17]=x(4)-x(6)
==> _[18]=x(4)-x(7)
==> _[19]=x(5)-x(6)
==> _[20]=x(5)-x(7)
==> _[21]=x(6)-x(7)
==>