custs1:
name  - John Doe
phone - 12345
name  - Jane Doe
phone - 67890

custs2:
name  - John Doe
phone - 12345
name  - Jane Doe
phone - 67890

custs3:
name  - John Doe
phone - 12345
name  - Jane Doe
phone - 67890

custs4:
name  - John Doe
phone - 12345

name:
name  - John Doe
name  - Jane Doe