5178
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 a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
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