These SCTP DATA chunks have arrived carrying the following information:

TSN:20 SI:2 SSN:8 BE:11

TSN:21 SI:2 SSN:9 BE:10

TSN:12 SI:2 SSN:7 BE:11

TSN:18 SI:3 SSN:15 BE:01

TSN:15 SI:3 SSN:15 BE:00

TSN:24 SI:1 SSN:23 BE:10

In the following, fragment refers to a data chunk that is NOT a complete message.

Which data chunks are complete messages?

Which data chunk(s) is/are first fragment(s)?

Which data chunk(s) is/are last fragment(s)?

Which fragments for sure are missing for the message with SI = 3 and SSN = 15?

Which fragments for sure are missing for the message with SI = 2 and SSN = 9?