Horizontal-1  

• Second-1
• Second-2
  • Third-1
  • Third-2

Horizontal-2  

• Second-3
  • Third-3
  • Third-4
• Second-4

Horizontal-3  

• Second-5
• Second-6
  • Third-5
  • Third-6

Vertical-1

• Second-1
• Second-2
  • Third-1
  • Third-2