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$qqq = undef(); $www = undef(); ... $ttt->{zxc} = 789; printf "'%s' '%s' '%s' '%s'\n", $ttt, $yyy, $ttt->{zxc}, $yyy->{zxc};
'HASH(0x81551c8)' 'HASH(0x81552d0)' '123' '' '' '' '456' '456' 'Test' 'Test' '789' '789'