There are six letters \( \mathrm{L}_{1}, \mathrm{~L}_{2}, \mathrm{~L}_{3}, \mathrm{~L}_{4}, \mat...

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There are six letters \( \mathrm{L}_{1}, \mathrm{~L}_{2}, \mathrm{~L}_{3}, \mathrm{~L}_{4}, \mathrm{~L}_{5}, \mathrm{~L}_{6} \) and their corresponding six envelopes \( \mathrm{E}_{1}, \mathrm{E}_{2}, \mathrm{E}_{3}, \mathrm{E}_{4}, \mathrm{E}_{5}, \mathrm{E}_{6} \). Letters having odd value can be put into odd value envelopes and even value letters can be put into even value envelopes, so that no letter go into the right envelopes, then number of arrangement equals.
(a) 6
(b) 9
(c) 44
(d) 4
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