Pen Case

• 
  Example:C-B-E-C

• 
  Example:E-I-A-J

• 
  Example:E-H-B-F

• 
  Example:F-I-A-I

• 
  Example:G-C-G-N

• 
  Example:I-F-G-M

• 
  Example:F-I-Z-I