How to make intera personal and extra personal pairs for face verification in matlab

I have data like this ( In my data I have class associated with each row like if one row is for first person then class is 1,for second person class 2 for identification)

> 1 3 5 6 first person

> 4 5 8 9 first person

> 9 78 34 7 first person

>10 15 25 1 second person

>4 7 2 20 second person

Now I want to find out intra personal pairs that is array pair of same person eg. for first person pairs will be:-

>1 3 5 6 first pair

> 4 5 8 9

>1 3 5 6 second pair

> 9 78 34 7

> 4 5 8 9 third pair

> 9 78 34 7

>now for second person possible intra pairs(only one pair):-

>10 15 25 1 first pair

>4 7 2 20

>For extra personal pairs(pair with different person):-

>For first person possible extra personal pairs:-

> 1 3 5 6 (first pair)

>10 15 25 1

>1 3 5 6(second pair)

>4 7 2 20

> 4 5 8 9 (3rd pair)

>10 15 25 1

>4 5 8 9 (4rth pair)

>4 7 2 20

>9 78 34 7 (5th pair)

>10 15 25 1

>9 78 34 7 (6th pair)

>4 7 2 20

>similarly extra pairs can be created for second person

>And I want to give these pairs one by one into function like:-

> function[x]=fv(g1,g2) % gi and g2 are two array from one pair

>Does anyone know an elegant solution to this? please help... Thanks...