text: function Retro() {  // http://ai.neocities.org/KbRetro.html
    if (kbzap == 432 || kbzap == 404) {  // 2018-01-28: if 432=YES or 404=NO...
      if (kbzap == 404) {  // 2018-01-28: 404=NO;
      apb = "KbRetro() adjusts the knowledge base for the answer: NO";
      Voice(); // 2018-01-29: display "apb" message
      Psy[tkbv] = new // 2018-01-27: changing psi3=act; psi5=jux;
     psyNode(0,quverb,1,32,0,250,8,0,0,0,qusub,psi11,quobj,tkbo,0);  // 2018-10-11
      }  // 2018-01-27: End of test for "no" answer.
      if (kbzap == 432) { // 2018-01-28: 432=YES;
        apb = "KbRetro() adjusts the knowledge base for the answer: YES";
        Voice(); // 2018-01-29: display "apb" message
        Psy[tkbv].psyExam(); // 2018-01-27: expose all values to change one;
     Psy[tkbv] = new  // 2018-01-27: changing psi0=tru(th); psi3=act;
   psyNode(0,psi1,1,64,0,0,8,3,1,0,qusub,psi11,quobj,tkbo,0);  // 2018-10-11: 1=English
      }  // 2018-01-27: end of test for a "yes" answer.
      Psy[tkbn].psyExam(); // 2018-01-29: expose all values to change one;
      Psy[tkbn] = new // 2018-01-29: changing psi3=act; psi12=seq;
   psyNode(8,psi1,1,64,0,0,5,1,psi8,0,0,0,quverb,tkbv,0);  // 2018-10-11: 1 = English
      Psy[tkbo].psyExam(); // 2018-01-29: may cause "Error on page"?
      Psy[tkbo] = new // 2018-01-29: changing psi3=act; psi7=dba; psi10=pre;
    psyNode(0,psi1,1,64,0,0,5,4,0,0,quverb,0,0,0,0);  // 2018-10-11: hlc 1 = English
    }  // 2018-01-27: end of test for either yes or no.
    else {  // 2018-01-27: if neither;
    Psy[tkbn].psyExam(); // 2018-01-27: remove associative pre and seq tags from noun;
    Psy[tkbn] = new  // 2018-01-27: changing psi10=pre; psi12=seq.
   psyNode(psi0,psi1,psi2,psi3,psi4,psi5,psi6,psi7,psi8,psi9,0,psi11,0,psi13,psi14);
    Psy[tkbv].psyExam(); // 2018-01-27: remove associative pre and seq tags from verb;
    Psy[tkbv] = new  // 2018-01-27: changing psi10=pre; psi12=seq.
   psyNode(psi0,psi1,psi2,psi3,psi4,psi5,psi6,psi7,psi8,psi9,0,psi11,0,psi13,psi14);
    }  // 2018-01-27: end of else-clause.
    quobj = 0;  // 2018-01-29: reset for safety.
    tkbn = 0;   // 2018-01-27: reset for safety;
    tkbv = 0;   // 2018-01-27: reset for safety;
    PsiDecay()  // 2018-01-27: for distribution of PsiDecay influence;
  }  // 2018-01-28: KbRetro() returns to EnThink()
  
  module.exports = Retro;
  