You need to do a join on 2 flows and the output should have the matching records as well as the unmatching records from In0. What type of join will you use?
Inner Join
Explicit Join ( record-required 0 = true, record-required 1 = true )
Explicit Join ( record-required 0 = false, record-required 1 = true )
Explicit Join ( record-required 0 = true, record-required 1 = false )