#  u_01.txt
#
#  A 3 by 5 array:
#
#    111  112  113  114  115
#    121  122  123  124  125
#    131  132  133  134  135
#
#  written as a vector, preserving columns.
#
  111
  121
  131
  112
  122
  132
  113
  123
  133
  114
  124
  134
  115
  125
  135