PSR B1620−26
The system is composed of a pulsar ( PSR B1620−26 A ) and a white dwarf star ( WD B1620−26 ) or PSR B1620−26 B ) . 
<triplet> pulsar <subj> white dwarf <obj> subclass of <triplet> PSR B1620−26 <subj> pulsar <obj> instance of <triplet> PSR B1620−26 <subj> pulsar <obj> instance of