Cyclic Difference Set (103, 51, 25)

    1     2     4     7     8     9    13    14    15    16    17    18
   19    23    25    26    28    29    30    32    33    34    36    38
   41    46    49    50    52    55    56    58    59    60    61    63
   64    66    68    72    76    79    81    82    83    91    92    93
   97    98   100