1030
on the seleucid right flank atticus deployed the elite companions screened by a single unit of scythian horse archers .
 member collection: unit, archers
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: component whole, NA, instrument agency, member collection, cause effect, entity destination, content container, message topic, product producer, entity origin 
Text: {0} 
 Entity Pairs:  unit, archers 
Answer:
 member collection: unit, archers