a        b        c         d       e        f       g       h       i       j        k        l         m       n        o        p   $null$
a            17,928      486    2,142     2,252     124      621     149     165     183     229      408      518       849      82      285      583        1
b             1,137   12,678    2,901     5,370     473    1,047     107   1,092     649     138    1,977    2,433       825     139      586    1,269        2
c             3,004    1,758   36,481     9,498     466    2,091     442     666     200     638    1,123      781     2,334     221      957    3,017        0
d             2,317    2,778    8,068   112,594   1,975    4,463     190   1,910     532   1,433    1,703    1,517     1,766     142      374      953        1
e               146      119      334     2,116   8,981    1,400     440     308      49     294      839      164       201     332       44       55        0
f               905      556    2,543     6,638   1,329   29,517     192     603     115     750    1,892    1,502     1,915     147      227      474        1
g               248      142      972       384     889      423   1,677      78      29     104      325      310       634     730      255      894        0
h               167      586      395     1,409     532      620      54   7,953      91     187    1,203      503       323     103    1,305      118        2
i               210      550      284       945      93      229      37     177   5,055     646      338      388       181      72      134    1,394        1
j                88       47      117       403     102      341      21     203     503   2,934      303      222       176      47       55      546        0
k               548      752      815     1,578     563    1,758     140     778     330     380   27,204    1,791     2,649     319      294      566        0
l               754    1,653      758     1,354     171    2,157     151     344     399     327    2,144   22,974     4,068     565      852      739        0
m             1,319      726    4,910     1,814      96    4,433   1,528     274      95     558    5,252    5,293   205,473   4,048    4,049    9,255        0
n                94       59      136        81     251      115     622      32      19      86      496      355       885   9,147      303      563        0
o               253      310      639       223      35      179     159     757      45      53      240      518       997     237   12,493      956        0
p               431      622    1,696       628      19      300     195      65     592     661      339      382     1,542     511      538   16,377        1