Devise a scenario in which multicasts sent by different clients are delivered in different orders at
two group members. Assume that some form of message retransmissions are in use, but that
messages that are not dropped arrive in sender ordering. Suggest how recipients might remedy this
situation.

What will be an ideal response?

Sender1 sends request r1 to members m1 and m2 but the message to m2 is dropped
Sender2 sends request r2 to members m1 and m2 (both arrive safely)
Sender1 re-transmits request r1 to member m2 (it arrives safely).
Member m1 receives the messages in the order r1;r2. However m2 receives them in the order r2;r1.
To remedy the situation. Each recipient delivers messages to its application in sender order. When it receives
a message that is ahead of the next one expected, it hold it back until it has received and delivered the earlier
re-transmitted messages.