Solution:
(1) The code for 'R' is '10', '21', '32', '43' and '04'; the code for 'I' is '55', '66', '77', '88' and '99'; the code for 'P' is '00', '11', '22', '33', and '44', and the code for 'E' is '58', '69', '75', '86' and '97'.
Hence the code of RIPE can be 43, 88, 44, 86.
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