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%simpsons = ("father" => "homer", "mother" => "marge", "son" => "bart"
+, "daughter" => "lisa"); #deprecated maggie
$string = "simpsons";
...
print("$$string{mother}\n"); #case2 prints "marge"
print("$$array[0]{son}\n"); #case3 err
print("$$hash{family}{daughter}\n"); #case4 err

$ar = $array[0];
print("$$ar{son}\n");