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$a[0][0] = ['00', '01'];
$a[0][1] = ['10', '11'];
...
   1  ARRAY(0x55bb8d543fb8)
      0  10
      1  11

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DB<69> x @a[0]
0  ARRAY(0x55bb8ce673d8)
   0 undef
   1  ARRAY(0x55bb8d543fb8)
      0  10
      1  11