178
Hitherto , smooth motion has been encouraged using a trajectory basis , yielding a hard combinatorial problem with time complexity growing exponentially in the number of frames .
 used for: trajectory basis, smooth motion; evaluate for: time complexity, hard combinatorial problem
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: trajectory basis, smooth motion; evaluate for: time complexity, hard combinatorial problem