(n,vs) classification; color coding; colour coding; color keying; colour keying; differentiation using different colors (colours)[edict]
を
(prt) (arch) (See を) marks object of action, etc. (also adds emphasis)[edict]
覚える
おぼえる
(v1,vt) (1) to memorize; to memorise; to commit to memory; to learn by heart; to bear in mind; to remember; (2) (覚える only) to learn; to pick up; to acquire; (3) (覚える only) to feel; (4) (覚える only) to think; to regard; (P)[edict]