Background:spin configuration argument 1D chain magnet with the competition between NN FM coupling (J)and NNN AFM coupling (J)favors FSO if J'/J>1/4.(JPCM7,8605(1995) J'>0 J<0 Spin on the third site can't be consistent with the J AFM triangular-lattice AF favors FSO.Background: spin configuration argument  AFM triangular-lattice favors FSO.  1D chain magnet with the competition between NN FM coupling (J) and NNN AFM coupling (J ) favors FSO if |J /J|>1/4. (JPCM 7, 8605 (1995))