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'.

Sentence 1:It is the most historic area of Derby , the location of a large fortified Roman settlement , which they called Derventio . Sentence 2:nan
SINGLE_APPOSITION

Sentence 1:In his first year , he came off the bench in 23 games and averaged fewer than four points while never starting . Sentence 2:nan
SINGLE_VP_COORD

Sentence 1:Since the Lampropholis delicata species is not native to the area in which they are found , it is possible that the resulting morphs are caused by the exposure to a new environment and climate as this particular species ' activity level is temperature dependent . Sentence 2:nan

SINGLE_CONN_START