8590
Conventional non-rigid surface tracking performs frame-to-frame alignment which is subject to the accumulation of errors resulting in a drift over time .
 used for: frame-to-frame alignment, non-rigid surface tracking
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:  frame-to-frame alignment, non-rigid surface tracking 
Answer:
 used for: frame-to-frame alignment, non-rigid surface tracking