From the Lojban web site FAQ (http://www.lojban.org/files/brochures/faq.htm):
tanru: a phrase formed of two or more Lojban brivla
"jbena djedi...can be seen as a shortening for jbena nunsalci djedi (and omission of such intermediate clarifying terms is an acceptable Lojban tanru
form). " — Bob LeChevalier