日語 Japanese Ask Questions Thread2 質問

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Japanese - Ask questions thread
http://dis.4chan.org/read/lang/1174719097/l50

>>856
It's the past tense form of 置いとく, which is a contraction of 置いておく (て-form + おく = to prepare something in advance).

http://www.e-japanese.jp/quiz/grammar3/teoku.htm