constructor(config) {
        super(config);

        this.single = config.single;
        this.pair = config.pair;
    }
Creates a new instance of `TemplateProcessing`.
@param {Object} config The configuration options for the post processor.
@param {Array} config.single The template for a single sequence of tokens.
@param {Array} config.pair The template for a pair of sequences of tokens.