How can I select the common value from table?

Hello every one

I have this cell

S=

2

1 2 3

1 2 5

1 5

and the data like this

T=

1 2 4 5

2 3 5

1 2 4 5

1 2 3 5

each line from S I count it appearance in T as well as its index

I obtained this

vect=[ 3 1 3 4]

index=[1 2 3 4]

I sorted them and I obtained:

vect=[4 3 3 1 ]

index=[4 1 3 2]

So,

My issue is:

I want to remove the common value exist in almost all value of S

for example

value=2;

exist in all most of S, then I removed it

How Can I do thant?

thank you