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D is necessary

D is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessary
D is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessary
D is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessaryD is necessary