What character(s) does a bitstring is encoded in each character set?

Bitstring:
Binary  Hexadecimal 
EncodingBitstringCharacter(s)
ISO-8859-13f81803f3f3f3f3f3f61?€??????a
SJIS-WIN3f81803f3f3f3f3f3f61?÷??????a
EUC-JP3f81803f3f3f3f3f3f61?????????a
UTF-83f81803f3f3f3f3f3f61?????????a
UHC3f81803f3f3f3f3f3f61????????a