程序和错误如下：
INPUT INSTRUCTIONS

  TITLE: LATENT UNSPECIFIED CURVE MODEL
  DATA: FILE IS C:\Users\sqy\Desktop\SSS.dat;
  VARIABLE: NAMES ARE V1 V2 V3 gender;
  USEVAR=V1-V3;
  MODEL F1 BY V1-V3@1;
        F2 BY V1@0 V2@1 v3@2;
        [V1-V3@0];
        V1-V3;
         F1 WITH F2;
  F1 F2;
  [F1 F2];
   [V1-V3@0];
        V1-V3;
  OUTPUT SAMP STANDARDIZED;
*** ERROR in VARIABLE command
  Unknown option:
  MODEL