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as much as one can; as much as possible; if at all possible
できるだけ早くはやく来きてください。
Please come as soon as possible.
できるだけ毎日まいにち運動うんどうを頑張りがんばります。
I'll try as hard as I can.
できるだけ静かしずかに歩いあるいた。
I walked as quietly as possible.