sec2.1	Examples from Section 2.1
sec2.2	Examples from Section 2.2
sec2.3	Examples from Section 2.3
sec2.4	Examples from Section 2.4
sec2.5	Examples from Section 2.5
sec3.1	Examples from Section 3.1
sec3.2	Examples from Section 3.2
sec3.3	Examples from Section 3.3
sec3.4	Examples from Section 3.4
sec4.1	Examples from Section 4.1
sec6.2	Examples from Section 6.2
sec6.4	Examples from Section 6.4
sec6.5	Examples from Section 6.5
sec7.1	Examples from Section 7.1
sec7.2	Examples from Section 7.2
examples Examples yet to be put into sections
