B up for retail sale : B. Yarn of regenerated textile fibres : 51.01-50 , 61 , 67 , 68 , 71 , Yarn of regenerated textile fibres 77 , 78 , 80 ( continuous ), not put up for retail sale , other than single yarn of viscose rayon untwisted or with a twist of not more than 250 turns per metre and single non-textured yarn of any acetate ---pagebreak--- 31 . 12 . 86 Jornal Oficial das Comunidades Europeias N ? L 388 / 19 NIMEXE Table of equivalence Category CCT heading No code Description ( 1982 ) pieces / kg g / piece