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#!/bin/sh
sed '/\[--.*--\]/d' |
sed '/\[\(--[^]]*--\|cid:[^]]*\)\]/d' |
sed '/\[\(twitter\|instagram\|linkedin\|facebook\)\]/d' |
sed '/[^[:space:]]/,$!d' |
awk 'BEGIN{blank=0} /^[[:space:]]*$/{blank++; if(blank<=2) print; next} {blank=0; print}'
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