even

odd & even

odd & even

multiples of 3

Diagnle lines

Multiples of 5

Diagnnle lines of 3

They all add up to 9

0,1,2,3,,4,5,6,7,8,9 & 9,8,7,6,5,4,3,2,1

Some overlap with 9

Usually close to 6

Some overlap with 6