~んがため(に)/~んがための      => in order to ~ N1
ずくめ => completely; entirely; nothing but ~ N1
んがため => For the purpose of doing A N1
Reason, Result, Response
ずくめ => Completely A, entirely A N1
Degree/ Level/Amount
に先立って => before; prior to ~ N2
に[先立「さきだ」]って/に[先立「さきだ」]ち/に[先立「さきだ」]つ => Before A occurs/takes place N2
Time, Situation
ため => In order to, for N4
Purpose, target
ため(に) => For, because… N4
Cause and Effect
めったな => hardly; rarely; seldom N2
Ban
めったにない => Rarely N3
Degree. Level, Amount
あらためる => to revise; to replace N3
Happens next
めったに~ない => hardly; rarely; seldom N3