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int in_symbol() const { return p_in_symbol; }
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int out_symbol() const { return p_out_symbol; }
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void set_weight(float f) { p_weight = f; }
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typedef EST_TList<EST_WFST_Transition *> wfst_translist;
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enum wfst_state_type {wfst_final, wfst_nonfinal, wfst_error, wfst_licence};
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/** an internal class for \Ref{EST_WFST} used to represent a