[r-t] Ocean Finance Doubles

[Philip Earis]

This evening we rang an extent of a new asymmetric Doubles Principle - Ocean 
Finance Doubles.

There are six changes per division - the notation for a plain division is 
+3.5.123.1.3.123

To obtain an extent, there are two types of calls:

T = 345 (instead of 123) at division end
A = 145 (instead of 123) at division end

Composition:
TppTppTppTppTpAppppA

Extents usually consist of an assembly of mutually true courses.  This one 
doesn't.  So how does it "work"?