Oops! Bar 11, 3rd event = a2, not c2.
> |\ |\ |\ |\ |\
> | |\ |\ | |\
> | |\ | | |\
> |. | | | |
> ________________________a______________
> _d__c_c_|_c_______|_______d_c____d___|_
> _a______|_e_f___e_|_f_______d_d__b_a_|_
> ________|_e___e___|_f_______c________|_
> _c__a___|_________|_________a____c___|_
> ______d_|_c_______|___d______________|_
should be
> |\ |\ |\ |\ |\
> | |\ |\ | |\
> | |\ | | |\
> |. | | | |
> ________________________a______________
> _d__c_a_|_c_______|_______d_c____d___|_
> _a______|_e_f___e_|_f_______d_d__b_a_|_
> ________|_e___e___|_f_______c________|_
> _c__a___|_________|_________a____c___|_
> ______d_|_c_______|___d______________|_
^
NB -----|
Best wishes,
Stewart.
