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# Group のサンプル(WEBからの参考)
PS > $a = @('a','b','x',10),
>> @('a','b','y',20),
>> @('c','e','x',50),
>> @('c','e','y',30)
PS > $a | Group-Object @{ Expression={$_[0]} },@{ Expression = {$_[1]} }

Count Name                      Group
----- ----                      -----
    2 a, b                      {a b x 10, a b y 20}
    2 c, e                      {c e x 50, c e y 30}

PS > $a | Group-Object {$_[0]},{$_[1]}

Count Name                      Group
----- ----                      -----
    2 a, b                      {a b x 10, a b y 20}
    2 c, e                      {c e x 50, c e y 30}