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105   int64 source;           // 'ifst' state to expand
110        source(kNoStateId), dest(kNoStateId) {}
124   if (opts.source == kNoStateId) {   // first call
130     nopts.source = ifst.Start();
135     if (ifst.NumArcs(opts.source) == 0 &&
136 	ifst.Final(opts.source) == Weight::Zero())  // Non-coaccessible
138     // Pick a random transition from the source state
139     size_t n = opts.arc_selector(ifst, opts.source);
140     if (n == ifst.NumArcs(opts.source)) {  // Take 'super-final' transition
143       ArcIterator< Fst<Arc> > aiter(ifst, opts.source);
150       nopts.source = iarc.nextstate;