Table Stream Schemes

At the 5 February 2011 CoCo Cafe in Scotland there were three topics and between 6-9 people.
The aim of the two stream schemes below were to ensure that everybody sees everybody and has visited all the three topic tables.

Scheme with table hosts
Everybody sees different people but the table hosts see only their own table/topic 

Round Topic 1 Topic 2 Topic 3
1 abc def  ghi
2 aei dbh gcf
3 afh dci gbe
4 The people who
haven't seen each other
group together.

The people are assigned letters of the alphabet.

Scheme without table hosts.
This scheme can easily be extended to accommodate 6-12 people.
If only nine two people travel all the three topics. Disadvantage is the transfer of information from table to table.

Round Topic 1 Topic 2 Topic 3
1 abc def  ghi
2 fgh abi cde
3 dei cgh abf
4 The people who
haven't seen each other
group together.