I reported the caluculation of the size of original and normalized rdn is as follows.
len_rdn is the size of original rdn. len_norm_rdn is the size of normalized rdn.
((3 + len_norm_rdn) * 3) less than equal to ((3 + len_norm_rdn) + 1 + len_rdn + 1 + 8)
But after the test about verious sizes of rdn, the above calculation does not cover the all cases and the next simple calculation should match more verious sizes.
len_rdn + 3 > len_norm_rdn x 2
-- Yoshiho Yoshida
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