When searching on paper code - do not add a space between the letters and numbers of a paper code. ie "STAT110" not "STAT 110".
Every paper is identified by a subject code (e.g. RELS for Religious Studies) and a paper number. Until 2014, variants of those codes, ending with 'X', were used for distance learning papers (e.g. RELX for distance papers in Religious Studies), but a single code is now normally used for all papers in the same subject, whether they are offered as internal papers or as distance learning papers or as both (so RELS is the code for all Religious Studies papers regardless of teaching mode).