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Subject: [Bitcoin-development] Can this tx be formed?
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Say Alice signs and broadcasts a tx with input Ai, with SIGHASH_SINGLE
to Ao and SIGHASH_ANYONECANPAY
Bob signs and broadcasts a tx with input Bi, with SIGHASH_SINGLE to Bo
and SIGHASH_ANYONECANPAY

Can Carol complete the tx so that it is valid to be published in the chain?
It only has to make Ai + Bi + Ci + F = Ao + Bo + Co
but it all must be contained in a single transaction.