instruction:
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'.
question:
Sentence 1:Robert M. Ricketts developed the Utility arch in 1950s and it is considered to be an integral part of the Bioprogressive Therapy in Orthodontics . Sentence 2:nan
answer:
SINGLE_S_COORD_ANAPHORA


question:
Sentence 1:Flying his Albatros D.Va marked with blue and white diamonds , he scored a victory for his new squadron on 9 December 1917 , to run his total to seven . Sentence 2:nan
answer:
SINGLE_CATAPHORA


question:
Sentence 1:Although she dreamed about winning the gold medal in front of home crowd , Radulovics had to be content herself with a bronze after Hungary lost to Norway in the semifinals and beat Russia in the third place match . Sentence 2:nan
answer:

SINGLE_CONN_START