|a- -ing||(Archaic) Used to form present participles and verbal nouns; and, (dialectal) circumfixed to words which function as part of a verb phrase (e.g. he went 'a-'hunt'ing')|
|em- -en||Prebilabial form of en- -en; i.e., occurring when the first element precedes a ‘b’, ‘p’, or ‘m’.|
|en- -en||Forms transitive verbs denoting an increase in, or intensification of, the quality denoted by the enclosed word.|
Note: these words have been obtained from Wiktionary and have been classified and improved through automated computer linguistics processes.