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'.

Ex Input:
Sentence 1:What is in issue will depend on the nature of the defence . Sentence 2:For example , where the defence is an alibi , the presence or absence of the accused at the particular place is crucial , and similar fact evidence could conceivably be relevant .

Ex Output:
PAIR_CONN


Ex Input:
Sentence 1:It is always at amateur level . Sentence 2:However , lacrosse in Scotland goes back to 1890 at St Leonards School , Fife , where women 's lacrosse had been introduced by Louisa Lumsden .

Ex Output:
PAIR_CONN


Ex Input:
Sentence 1:Petersen did not base himself in Britain for 2015 and estimated he would make 20 trips back and forth from South Africa during the year . Sentence 2:nan

Ex Output:

SINGLE_VP_COORD