what can i do?

hi every one....

i have a design measure the distance between two samples (inputs),
d(s1,s2). and i want to ask a question


if i have 4 samples such as [ s1,s2,s3,s4 ] and i want to get the 
distances between every two samples, then i would have 
d(s1,s2),d(s1,s3),d(s1,s4),d(s2,s3),d(s2,s4)and d(s3,s4).
what should i do 1 or 2

1- should i repeat that module 6 times and i would have 6 component of 
it connected together to get the 6 distances between every sample and 
the other ...or

2- should i use that module one time and store the distance in register 
and reset the module then measure the distance between the next two 
samples and store the the result in another register again and so on....

 because i will need the distances result for sum them all.

thanks for help.