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'.

Example Input: Sentence 1:Both meanings usually exist also in Portuguese , but with one and the same gender , so that they ca n't be differentiated unless further information is provided . Sentence 2:nan
Example Output: SINGLE_CONN_INNER_ANAPHORA

Example Input: Sentence 1:In response , Mulock organized a group of prominent businessmen from the Newmarket area to travel to Ottawa to meet with Laurier . Sentence 2:They arrived on 21 February 1905 and found the Prime Minister more than interested in the project , and he noted :
Example Output: PAIR_ANAPHORA

Example Input: Sentence 1:Mart Stam , who worked during 1926 as employee - designer at the Brinkman & Van der Vlugt office in Rotterdam , came in contact with the Russian Avant - Garde in 1922 in Berlin . Sentence 2:nan
Example Output:
SINGLE_RELATIVE