"First four" = 0, 1, 2, 3. And each Carré, Square or Corner in area 1-36 has two of its four numbers situated in the middle column. Methods on these groups of four numbers are not the most common ones. Maybe the Whole Picture is too complex?
Anyway, I have developed a flat betting system there that does not even require pen and paper:
Each and every spin (in my session, that is) I bet "first four".
Each time 34-36 comes, the NEXT HIGHER GROUP is added to betting.
So if we were facing a long series og the highest street in the beginning of our session,
we should add these groups in this order: 1-4, 2-6, 4-8, 5-9, 7-11, 8-12. And so forth and so on.
Of course we don´t see such long series on 34-36 every day.
HITTING (one or more groups at the same time) results in leaving only one group:
I then leave the highest of the ones that I just bet.
PLEASE NOTE THAT HITTING HERE OR THERE IN THE FOLLOWING SPIN DOES NOT RESULT IN
LEAVING ANY GROUP. In this way we may profit from hits following hits.
It is not likely that we´ll expand our betting too much.
It is more likely that we´ll leave "first four" at last.
When that happens, our session ends.