Powershell Multidimensional Arrays

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You are trying to create an associative array (hash). Try out the following
sequence of commands

$arr=@{}
$arr["david"] = @{}
$arr["david"]["TSHIRTS"] = @{}    
$arr["david"]["TSHIRTS"]["SIZE"] ="M"
$arr.david.tshirts.size

Note the difference between hashes and arrays

$a = @{} # hash
$a = @() # array

Arrays can only have non-negative integers as indexes

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