Column 5
attach to: 3,7,11,15,19 ... => 3 mod 4
left side: 1,2,3,4,5,6 ... => 1 mod 1
remaining: 0,1,2 mod 4
Column 6
attach to: 1,5,9,13,17 ... => 1 mod 4
left side: 1,4,7,10,13 1 mod 3
remaining: 0,2 mod 4
double steps:
if 3 mod 4 = 1 mod 3: 7,19,31 => 7 mod 12
if 1 mod 4 = 1 mod 3: 1,13,25 => 1 mod 12
Column 9
attach to: 2,10,18,26,34 => 2 mod 8
left side: 1,4,7,10,13 1 mod 3
remaining: 0,4,6 mod 8
double steps:
if 2 mod 8 = 1 mod 3: 10,34,58 => 10 mod 24
Column 10
attach to: 6,14,22 => 6 mod 8
left side: 7,16,25 7 mod 9
remaining: 0,4 mod 8
double steps:
if 6 mod 8 = 1 mod 3: 22,46,70 => 22 mod 24
if 1 mod 4 = 7 mod 9: 25,61,97 => 25 mod 36
if 3 mod 4 = 7 mod 9: 7,43,79 => 7 mod 36
triple steps:
if 1 mod 12 = 25 mod 36 => 25 mod 36
if 7 mod 12 = 7 mod 36 => 7 mod 36