CREATE TABLE IF NOT EXISTS
	`concept_expressions`(
		`id`
			INTEGER
			PRIMARY KEY
			AUTOINCREMENT
		,
		`concept_id`
			INTEGER
			NOT NULL
		,
		`expression_id`
			INTEGER
			NOT NULL
		,
		FOREIGN KEY
			(`concept_id`)
			REFERENCES `concepts`(`id`)
		,
		FOREIGN KEY
			(`expression_id`)
			REFERENCES `expression`(`id`)
	)
;
