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--- The Week 週 [week]
毎週 maishū every week 週 [week]  Ref. 毎 [every]
次週 jishū next week   Ref. 次 [next | vice]
今週 konshū this week   Ref. 週 [week]
先週 senshū last week (= the week before) 先 [ahead]  Ref. 週 [week]
一週間 isshūkan for one week | the all week   Ref. 週 [week]