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$rows = $dbh->do("UPDATE checkin
        SET    destination =
...
        WHERE firstname='Henry' AND lastname='Rollins')
        WHERE  firstname='Bill' AND lastname='Gates'
") || die "Couldn't insert record : $DBI::errstr";

---
print map { my ($m)=1<<hex($_)&11?' ':'';
$m.=substr('AHJPacehklnorstu',hex($_),1) }
split //,'2fde0abe76c36c914586c';