( ## print "with whitespace" ## )
( ##= "with whitespace" ## )
( ##.= "without whitespace on the left" ## )
( ##= "without whitespace on the right" .## )
( ##.= "without whitespace" .## )
##= "conti-" ##
nued on the next line
##= "conti-" .##  
nued on the same line

specials: ####  -> ###
          ####. -> ###.
          .#### -> .###