------------------------------

The following verifies the Kasteleyn's formula (Eq. (15) in his classic pape\
    r), for various numeric z0 for all even n from 2 to 10

                                  When z0=, 1

                          When n=,, 2, the formula is

                                      true

                          When n=,, 4, the formula is

                                      true

                          When n=,, 6, the formula is

                                      true

                          When n=,, 8, the formula is

                                      true

                          When n=,, 10, the formula is

                                      true

                                  When z0=, 2

                          When n=,, 2, the formula is

                                      true

                          When n=,, 4, the formula is

                                      true

                          When n=,, 6, the formula is

                                      true

                          When n=,, 8, the formula is

                                      true

                          When n=,, 10, the formula is

                                      true

                                  When z0=, 3

                          When n=,, 2, the formula is

                                      true

                          When n=,, 4, the formula is

                                      true

                          When n=,, 6, the formula is

                                      true

                          When n=,, 8, the formula is

                                      true

                          When n=,, 10, the formula is

                                      true

                                  When z0=, 4

                          When n=,, 2, the formula is

                                      true

                          When n=,, 4, the formula is

                                      true

                          When n=,, 6, the formula is

                                      true

                          When n=,, 8, the formula is

                                      true

                          When n=,, 10, the formula is

                                      true

                          This took, 0.776, seconds.