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Insert
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Unlock Script (ScriptSig)
OP_0 <Sig1> <Sig3> OP_PUSHDATA1 <redeemScript>
of course the following signature combination <Sig1> <Sig2>, <Sig2> <Sig3>, <Sig1> <Sig2> <Sig3> are valid too.
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Lock Script (RedeemScriptHash)
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