Some determinants

| 4 -1 0 0|
| 2 -1 2 -1| = 31
|-1 1 1 1|
| 5 0 0 -2|

|-8 1 0 0|
| 2 -1 2 -1| = 41
|-1 1 1 1|
| 5 0 0 -2|

|12 0 0 0|
| 2 -1 2 -1| = 72
|-1 1 1 1|
| 5 0 0 -2|

Ratios are 441:440, 385:384 and 243:242.

Graham