static Web webFromTriple(CharSequence a, CharSequence b, CharSequence c) {

  ret webFromTriple(triple(symbol(a), symbol(b), symbol(c)));

}

static Web webFromTriple(Triple<Symbol> t) {

  if (t == null) null;

  ret webFromTriple(t, 0.2, 0.2, 0.8, 0.7);

}

static Web webFromTriple(Triple<Symbol> t, double x1, double y1, double x2, double y2) {

  if (t == null) null;

  Web web = webWithoutIndexAndLock(); // save space

  S a = unnull(str(t.a)), b = unnull(str(t.b)), c = unnull(str(t.c));

  // ensure we are making 3 nodes, even if texts are identical

  // ("singular is singular")

  WebNode nodeA = web.newNode(a), nodeC = web.newNode(c);

  web_addRelation(nodeA, nodeC, b);

  web_setPosition(first(web.nodes), x1, y1);

  web_setPosition(second(web.nodes), x2, y2);

  if (t instanceof TripleWeb) {

    TripleWeb w = cast t;

    web.globalID = w.globalID();

    web.created = w.created();

    web.source = w.source();

    web.unverified = w.unverified();

  }

  ret web;

}