A vasectomy interrupts sperm flow within the vas deferens. The vas deferens is supplied by an accompanying artery (artery of vas deferens). Males can be infertile due to congenital absence of the vas deferens. The accumulation of sperm increases pressure in the vas deferens and epididymis. Ejaculatory duct obstruction must not be confused with an obstruction of the vas deferens. This is necessary when there is no sperm present in the vas deferens. Hispavox released "Porque te vas" as a 7-inch single in 1974. Diagnosis of VAS is through a biopsy. This new band released the double A-sided single "Western Pasta" b/w "Vas plus haut" (1981). For example, the adjective vas becomes vaste when inflected. Treatment of VAS is through aggressive surgery. It was also revealed director Vasu Varma is co producing along with Bunny Vas. The word is an amalgamation of "mukh" meaning mouth and "vas" meaning smell. It stars Kimberley Nixon, Joe Cole, Shaun Dooley and Vas Blackwood. Well known automata simulators include Turing's World, JFLAP, VAS, TAGS and SimStudio.