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'.

Input: Consider Input: Sentence 1:Upper and rear parts were fabric covered . Sentence 2:Stability on the water was provided by a pair of unstepped floats under the wing , held a little beyond the central section on mountings within completely enclosing fairings .

Output: PAIR_NONE


Input: Consider Input: Sentence 1:Here he had a dispute with a neighbour about water rights , which led to a lawsuit and a challenge , although the English Consul Kirkup succeeded in arranging the point of honour satisfactorily . Sentence 2:nan

Output: SINGLE_RELATIVE


Input: Consider Input: Sentence 1:Galvanized steel offers more protection from rust , so this is usually used when the gusset plate is exposed to the elements . Sentence 2:nan


Output: SINGLE_S_COORD