[NB.40L]                                                              [NB.40]							40
                                                                      
[drawing] Masonry up		[diagram] b.	Cusps                              			[drawing]
					same section                                                     
                                                                      
[diagram] c                                                           
                                                                      
		[drawing] 1                                                         
                                                                      
                                                                      
                                                                      
                  [diagram] 3		[diagram] 2                            	upper squares not adjusted
                                                                          to lower ones Rather more than
                                                                      		less to each

[Version 0.05: May 2008]