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'.

Q: Sentence 1:Other USA - based start - ups include Carma , which is a graduate of the Techstars incubator program , and Condor . Sentence 2:nan

A: SINGLE_RELATIVE
****
Q: Sentence 1:Vidyapati tried his best , but could not locate the place of worship . Sentence 2:Finally , he could manage to marry Lalita , the daughter of Viswabasu .

A: PAIR_CONN_ANAPHORA
****
Q: Sentence 1:On 17 August 1940 , the first flight of the second prototype , L7245 , which was complete with full armament and operationally - representative equipment , was performed by Cordes from Radlett Aerodrome . Sentence 2:Upon its service acceptance , the HP57 was given the service name Halifax .

A:
PAIR_NONE
****