It's obvious that Bob was throwing down the gauntlet. Joh Stewart picked it up in 1971 with:

Shoot all the brave horses and how will we ride?
Shoot all the brave horses and how will we ride?
Shoot all the brave horses and how will we ride?
And ford the cold waters, how will we ride?

repeated many times (it's a 4 1/2 minute song)

Stewart apparently wasn't satisfied with that rejoinder because in 1975 he came up with:

Let him run, let him run
Oh let me see the big horse run
Let him run, let him run
Oh let him
Let him run
Let him run let him, oh let him
Let him run let him run, oh let him, etc.

After Stewart was done the horses would have a reason to be tired. Cycle back to Bob. This two author trilogy is also exponential. Dylan, first year. Stewart I, second year. Stewart II, four years later. I haven't seen this theory in print before just now.

rich r