Reading entry from 0x68d290 ... 
7 entries stored in matrix at 0x68d4d0.

matrix at 0x68d4d0 ...
    1 (4,2)     8 (4,3)     7 (3,1)     5 (2,3)     6 (3,2) 
    9 (1,2)     7 (1,1) 

Reading entry from 0x68d290 ... 
7 entries stored in matrix at 0x68d720.

matrix at 0x68d720 ...
   -8 (4,3)    -7 (1,1)    -5 (2,3)    -1 (4,2)    -6 (3,2) 
   -7 (3,1)    -9 (1,2) 

search 7 in matrix at 0x68d4d0 ...
3 1
1 1

find max in matrix at 0x68d4d0 ...
maximum 9 at position (1, 2)

Adding 0x68d4d0 to 0x68d010 ...

matrix at 0x68d2b0 ...
    1 (4,2)     8 (4,3)     7 (3,1)     5 (2,3)     6 (3,2) 
    9 (1,2)     7 (1,1) 

search 7 in matrix at 0x68d720 ...

find max in matrix at 0x68d720 ...
maximum -1 at position (4, 2)

Adding 0x68d720 to 0x68d2b0 ...

matrix at 0x68d4b0 has 0 non-zero entries.

matrix at 0x68d4b0 ...