# spaeth2_12.txt
#
#  Discussion:
#
#    Data matrix with 4 rows and 4 columns
#
#    The data values are 0 and 1.
#
#    The data is to to symmetrically permuted so that the 1's
#    form blocks.
#
#  Modified:
#
#    30 April 2002
#
#  Reference:
#
#    Helmut Spaeth,
#    Cluster Analysis Algorithms 
#    for Data Reduction and Classification of Objects,
#    Ellis Horwood, 1980, page 201.
#
1 0 1 0
0 1 0 1
1 0 1 0
0 1 0 1