2063
The scheme builds upon popular techniques of indexing descriptors extracted from local regions , and is robust to background clutter and occlusion .
 used for: scheme, background clutter; used for: scheme, occlusion; used for: indexing descriptors, scheme; used for: local regions, indexing descriptors; conjunction: background clutter, occlusion
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
 Entity Pairs:  scheme, background clutter; scheme, occlusion; indexing descriptors, scheme; local regions, indexing descriptors; background clutter, occlusion 
Answer:
 used for: scheme, background clutter; used for: scheme, occlusion; used for: indexing descriptors, scheme; used for: local regions, indexing descriptors; conjunction: background clutter, occlusion