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$z[ 0][ 8] = 'o';
$z[ 1][11] = 'o';
...
$z[ 3][ 1] = 'o';
$z[ 1][ 4] = 'o';
print"@$_\n"for@z;

z=[]
(z[ 0]||=[])[ 8] = 'o'
...
(z[ 3]||=[])[ 1] = 'o'
(z[ 1]||=[])[ 4] = 'o'
puts z.map{|i|(i||[]).join" "}