#  u_01.txt
#
#  A 7 by 5 array:
#
#    111  112  113  114  115
#    121  122  123  124  125
#    131  132  133  134  135
#    141  142  143  144  145
#    151  152  153  154  155
#    161  162  163  164  165
#    171  172  173  174  175
#
#  written as a vector, preserving columns.
#
  111
  121
  131
  141
  151
  161
  171
  112
  122
  132
  142
  152
  162
  172
  113
  123
  133
  143
  153
  163
  173
  114
  124
  134
  144
  154
  164
  174
  115
  125
  135
  145
  155
  165
  175