X F()X()C( )C(): F()X()X()C( )X()X( )C(): F( )X( )C(): F( )X( )X( )C()X():  DIFCAT=2nd+1st ORDER Nonlin CATENARY Problem to be MERGEd with DIFROOTS.C(J)=2,0 for 2nd order,0 for 1st order.Xo=EXP T/2-EXP-T/2:X1=EXP T/2-EXP-T/2.SEE BOOK `THE UNIVERSAL EQUATION SOLVER' page 128 for details.