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grep -i '^[rtesamcna]*$' TWL.txt 
| grep -iEv 'r.*r|t.*t|e.*e|s.*s|a.*a.*a|m.*m|c.*c|n.*n'

grep -i '^[rtesamcna]*$' TWL.txt 
| grep -iEv 'r.*r|t.*t|e.*e|s.*s|a.*a.*a|m.*m|c.*c|n.*n' | grep ......
+...