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:The first thematic group is striking for the breadth of its melodic content , which is not usual for any symphony , and is not found in Enescu 's previous four essays in the form . Sentence 2:nan
Example Output: SINGLE_RELATIVE

Example Input: Sentence 1:This topological space is zero - dimensional , and in particular , each point is an irreducible component . Sentence 2:nan
Example Output: SINGLE_S_COORD

Example Input: Sentence 1:The males reach sexual maturity at 2 to 4 years of age and around 8 cm ( 3.1 in ) , while females only reach maturity in their sixth or seventh year and at 11 to 16 cm . Sentence 2:nan
Example Output:
SINGLE_CONN_INNER

