Argh ...
try this
sed "s/ */ /g"
Blah.
sed 's/[ ][ ]/ /g'
The square brackets include a space and a tab each.
And of course, I got it wrong ...
sed 's/[ ][ ]*/ /g'
^
This sed expression is equivalent to procmail's "[ ]+": match
one or more of the preceding group.
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