A great way to remember a character is by searching for patterns across all the words that contain it. Can you find similarities?
|没关系||1||méi guān xi||it doesn't matter, that's all right|
|联系||4||lián xì||relation, connection; contact, connect|
|系领带||5||jì lǐng dài||wear a tie|
|系统||5||xì tǒng||systematic; system|
|体系||6||tǐ xì||system, setup|