arb=. ':'<@;(1;~":0)<@;<@((":0)&;)                     NB. AR of an explicit adverb from its body

   ara=. 1 :'arb u'                                       NB. The verb arb as an adverb
   srt=. 1 :'arb ''u u`:6('' , (5!:5<''u'') , '')`:6 y''' NB. AR of the self-replication and transformation adverb
   gab=. 1 :'u u`:6'                                      NB. The AR of the adverb and the adverb itself as a train

   Y=. ara srt gab                                        NB. Train of adverbs