Tell me the index of the label best describes the relation between E1 and E2 from the label list. 
The relation type can have two directions (E1, E2) or (E2, E1), depending on the context of the sentence. 
The labels are : 1) Cause-Effect(e1, e2)
2) Cause-Effect(e2, e1)
3) Instrument-Agency(e1, e2)
4) Instrument-Agency(e2, e1)
5) Product-Producer(e1, e2)
6) Product-Producer(e2, e1)
7) Content-Container(e1, e2)
8) Content-Container(e2, e1)
9) Entity-Origin(e1, e2)
10) Entity-Origin(e2, e1)
11) Entity-Destination(e1, e2)
12) Entity-Destination(e2, e1)
13) Component-Whole(e1, e2)
14) Component-Whole(e2, e1)
15) Member-Collection(e1, e2)
16) Member-Collection(e2, e1)
17) Message-Topic(e1, e2)
18) Message-Topic(e2, e1)
19) Other
"The [painting]_E1 was created by the famous [artist]_E2."  Just tell me the index of the label without explanation. The response should be in all capital letters.
user