The GRA held that there is a mitzva to eat matzos the whole seven days and thereby to sit in the sukkah all seven days which makes it an os, so no teffilin is worn on Chol Hamoed.
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The GRA held that there is a mitzva to eat matzos the whole seven days and thereby to sit in the sukkah all seven days which makes it an os, so no teffilin is worn on Chol Hamoed.