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VHDL Type Declaration error at <location>: object <name> with enumeration type cannot contain enumeration value <name> more than once

CAUSE: In a Type Declaration at the specified location in a VHDL Design File (.vhd), you listed the enumeration values for the specified object. However, you listed the specified value more than once. An enumeration type object can contain an enumeration value only once.
ACTION: Make sure that each enumeration value for the enumeration type object is listed only once in the Type Declaration.

See also:

Sections 3.1.1 and 4.1 of the IEEE Std 1076-1993 IEEE Standard VHDL Language Reference Manual

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