#  u_02.txt
#
#  A 3 by 5 array:
#
#    211  212  213  214  215
#    221  222  223  224  225
#    231  232  233  234  235
#
#  written as a vector, preserving columns.
#
  211
  221
  231
  212
  222
  232
  213
  223
  233
  214
  224
  234
  215
  225
  235