x1 is a padjedi word
A "padjedi" is a type 4 fu'ivla of the form CVCCVCV where the CC is a permissible initial cluster in Lojban, which causes it to split into a CV cmavo and a CCVCV gismu. For example, «padjedi» splits into pa djedi. See also valsi, valrtosmabru, valslinku'i, valrxazdomru.