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#!/usr/bin/awk -f
function s(t,i){while(match($0,t)){if(I[ni]==i)ni-=sub(t,"</"i">")
else if(sub(t,"<"i">"))I[++ni]=i}}BEGIN{FS="\n"; RS="";ni=0}
{s("[\\*_]{2}","strong");s("[\\*_]","em");s("`","code")
$0=(match($0,/^<.*>$/))?$0:"<p>"$0"</p>";print}