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: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

A: SINGLE_RELATIVE
****
Q: Sentence 1:Marriott was then able to track important metrics and provide superior customer service . Sentence 2:Additionally , Fairfield Inn placed a heavy emphasis on quality personnel selection to find friendly and positive staff that would also help reduce turnover .

A: PAIR_CONN_ANAPHORA
****
Q: Sentence 1:When Morgan accidentally squirts tomato ketchup over Billie 's hoody , Liam tries to wash off the stain but is caught by Carol ; who slaps him on his face , causing his forehead to bleed . Sentence 2:nan

A:
SINGLE_VP_COORD
****