s/M \([kgcjTDtd]\)/\.n \1/
s/M \([yrlvsShLG]\)/\.n \1/
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s/\\gdef//
s/\\mbh//
s/\\parvan//
/^\%/d
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s/\\centerline//
s/\\bigdn//
s/\\qquad//g
s/\\medskip//
s/\\medbreak//
s/\\,/ /g
s/\\!/ /g
s/\\bye//
s/|/\./g
s/\\\\//
s/{//g
s/}//g
s/  / /g
s/^ //g
s/\%//g
s/^$//g