In this task, you are given two sentences in the English language and your task is to classify them into one of their discourse types. A discourse type is an indicator to classify the given two sentences on the basis of a co-text as well as a relevant context. There are 13 discourse types in total which are 'SINGLE_S_COORD', 'SINGLE_CATAPHORA', 'SINGLE_CONN_INNER', 'SINGLE_APPOSITION', 'SINGLE_VP_COORD', 'SINGLE_CONN_START', 'PAIR_ANAPHORA', 'PAIR_CONN', 'SINGLE_RELATIVE', 'SINGLE_CONN_INNER_ANAPHORA', 'SINGLE_S_COORD_ANAPHORA', 'PAIR_CONN_ANAPHORA' and 'PAIR_NONE'.

Ex Input:
Sentence 1:At the Barcelona Open Banco Sabadell , he was able to reach the quarterfinals , losing to Nicolas Almagro . Sentence 2:However , he fell early at the Mutua Madrid Open and the Internazionali BNL d'Italia .

Ex Output:
PAIR_CONN


Ex Input:
Sentence 1:Following the breakup of the former Yugoslavia , he moved to Canada in 1994 with his family and continued his successful career there , appearing in several films and TV series . Sentence 2:nan

Ex Output:
SINGLE_VP_COORD


Ex Input:
Sentence 1:The fluid pumping efficiency of a valveless system , however , is not necessarily lower than that having valves . Sentence 2:In fact , many fluid - dynamical systems in nature and engineering more or less rely upon valveless pumping to transport the working fluids therein .

Ex Output:

PAIR_CONN


