Declare hash

SINGLE BLOCK (reading one file):
    Populate hash 

LOOP BLOCK (reading all other files):
    Remove data that isn't common from hash

Print hash data

##</code><code>##

Declare hash

start SINGLE BLOCK
    Populate hash 

    LOOP BLOCK

    Print hash data
end SINGLE BLOCK

##</code><code>##

{
    # code here
}