【多选题】
Given two different character sets (A and B), which of the following must be true for A to be considered a strict superset of B?（）
A、A must contain all of the characters defined in B
B、A must be Unicode
C、The encoded values in A must match the encoded values in B for all characters defined in B
D、A must be a multibyte character set
E、The encoded values in A must match the encoded values in B for all numeric and alphabetic characters in B
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