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				--- a/trainer.cpp
				+++ b/trainer.cpp
				@@ -93,7 +93,7 @@ class TrainerImpl: public Trainer {

				public:
				bool add(const Character &character) {
				- const std::string y = character.value();
				+ std::string y = character.value();
				CHECK_FALSE(!y.empty()) << "input character is empty";
				Features features;
				CHECK_FALSE(features.read(character)) << "cannot read character: " << y;
				@@ -103,7 +103,7 @@ class TrainerImpl: public Trainer {
				if (!fn) {
				return false;
				}
				- x_.push_back(std::make_pair<std::string, FeatureNode *>(y, fn));
				+ x_.push_back(std::make_pair(y, fn));
				return true;
				}

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