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package Bit_Packed_Array4 is type Data_Type is array (1 .. 39) of Boolean; pragma Pack (Data_Type); for Data_Type'Alignment use 1; type Message_Type is record Valid : Boolean; Data : Data_Type; end record; for Message_Type use record Valid at 0 range 0 .. 0; Data at 0 range 1 .. 39; end record; procedure Process (M : Message_Type); end Bit_Packed_Array4;