X F()X()C(
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 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.   