Silver.....ah, now I know what you were getting at. Sorry to get technical about the rules. I agree according to the rules you could not do the above (unless you got a lenient agent). For "Europe-Asia-SWPacific-Africa-Europe" you could do EUR - Asia - SWP - Africa (via Asia)- EUR as long as the rule for entering Asia twice is still in effect. Now that I am thinking about it, you could do Europe-Asia-Africa-SWPacific-NA-SA-Europe, right?
The only other itineraries I can think of that doesn't include an oceanic crossing is Asia - SWP - AFR - Asia and SWP - Asia - AFR - SWP.
Now that I have put more thought into it, you could go Asia - EUR - AFR - SWP (via Asia) - Asia and Asia - SWP - EUR (via Asia - AFR - Asia. You are heading westward technically but all but one seg is a legal backtrack. Now tell me what I am missing. It is late and I am going to bed.
OK, bed can wait...how about Asia - AFR - EUR - SWP (via Asia) - Asia. Consider the EUR - SWP the eastward direction and everything else a backtrack. I guess that logic class I took paid off.
There has got to be something wrong with each of those scenarios.