<BODY><P>I wrote</P>
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<P>Asei doche lo taaseh even if one could somehow both do a mitzva and avoid the lo taaseh. Tzitzit is doche k'laim, and wollen tzitzit can be put on a linen garment, even if linen tzitzit (without t'chelet) could possibly be used, both performing a mitzva (in perhaps a lesser way) and avoiding the lav. Despite the wording of the principle, I think it's fair to say that the lo taaseh is hutra, not merely d'chuya, by the asei.</P>
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<P>I neglected to qualify the above, as I should have, with "mikkar hadin, min haTorah". We do have the principle of Reish Lakish, cited in connection with both yibum Yevamot 20a) and tzitzit (Menachot 39b), that "efshar l'kayem et sheneihem, m'kayem". Tosfot in Menachot 40a d"h kevan says that this is m'dirabban, and the Rambam Tzitzit 3:6 says "din hu" that it is permissible to put wool tzitzit on a linen garment, but then says we do not do so because of the above cited principle. </P>
<P>>Despite the wording of the principle, I think it's fair to say that the lo taaseh is hutra, not merely d'chuya, by >the asei.</P>
<P>The cited Tosfot says this explicitly. There are several places where the term "kilaim hutru etzel tzitzit" appears.</P>
<P>Saul Mashbaum</P>
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