Changes

!  Meaning

!  Meaning

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| 0 || Present. This is forced set if bit1 is set, the only way to clear it is to clear *both* bit0 and bit1.

| 0 || Readable as key. This is forced set if bit1 is set, the only way to clear it is to clear *both* bit0 and bit1.

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|-

| 1 || Allowed as input

| 1 || Readable

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