John Hobbins over at Ancient Hebrew Poetry posits a hypothetical S source for Matthew, Mark, and Luke (specifically Mark 1:16-28; Matt 4:18–22; 7:28–29; Luke 4:31–37). It’s well worth a read.
UPDATE: John’s got a follow up comparing his S source to Matthew and Mark, concluding (among other things) it was unlikely Matthew used Mark as a source.
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