Consider the following example:

• We have a customer called John Doe
• John has 3 phone numbers:
  • MTN Rwanda: 0788000000 and 0788111111
  • Airtel Rwanda:0739000000

This is how we can represent these details:

 customer = 'John Doe':@FM:'MTN Rwanda':@VM:'0788000000':@SM:'0788111111':@FM:'Airtel Rwanda':@VM:'0739000000'
 CRT "Name: "      : customer<1>         ;* John Doe
 CRT "Operator1: " : customer<2,1>       ;* MTN Rwanda
 CRT "Phone1: "    : customer<2,2,1>     ;* 0788000000
 CRT "Phone2: "    : customer<2,2,2>     ;* 0788111111
 CRT "Operator2: " : customer<3,1>       ;* Airtel Rwanda
 CRT "Phone3: "    : customer<3,2,1>     ;* 0739000000

• We have one field for "Mobile Network Operator" which can have multiple values separated by @VM (Value Mark)
• We have one field for "Phone number" denoted by @SM (Sub-Value Mark)
• Here name are Single Field. The delimiter is @FM or @AM (Field Mark)