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NAME--REFERRAL
Jack--
...
Gabe--Jack
Pete--Gabe
Tim---Gabe

Jacks Referrals:
Level 1:
...
 -Tim
Level 3:
 -Henry

$sth = $dbh->do("SELECT referral FROM members WHERE username='Jack'");

@ref = "Bob|Gabe",
"Joe|Pete|Tim",
"Henry";