Regarding things seen, heard and felt:

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1.   Ask "When is it seen?"

　  Ask "When is it heard?"

 　 Ask "When is it felt?"

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2.   Each time answers come, ask "When is it?"

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3.   When there is no more answer, ask again:

      "When is it seen?"

　   "When is it heard?"

 　  "When is it felt?"

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4.   Repeat 2 〜 3