Syncope s/x => +is
Syncopated perfect sometimes drops the 'is' after 's' or 'x'
conscrips.isti V 3 1 PERF ACTIVE IND 2 S
conscribo, conscribere, conscripsi, conscriptus V (3rd) TRANS [XXXBO]
enroll/enlist/raise (army); write on/down, commit to/cover with writing; compos