I notice in Interface3.pdf that the heading above the paragraph explaining \tl_if_eq_p:NN etc. uses {<tl var1>}{<tl var2>} with braces around the tl vars, and for the next item, \tl_if_eq:nnTF, the first <token list> is without braces. Also in the section on comma lists, \clist_pop:NNTF uses <sequence> rather than <comma list>. Andrew --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus