I-mode gaps (or duplicate numbers) in sounding sequence:
(The soundings numbered below exist, gaps are in between),
     1 to      3
     3 to      6
     6 to     10
    11 to     13
    22 to     25
    25 to     42
    42 to     47
    48 to     54
    54 to     58
    62 to     88
   131 to    134
   136 to    138
   138 to    154
   165 to    168
   175 to    177
   228 to    228