View Compilation Error

0_0_31674436_19636.cpp: In function 'int main()':
0_0_31674436_19636.cpp:21:13: error: 'coun' was not declared in this scope
             coun[0][s1[i]-'a']++;
             ^
0_0_31674436_19636.cpp:25:13: error: 'coun' was not declared in this scope
             coun[1][s2[i]-'a']++;
             ^
0_0_31674436_19636.cpp:32:17: error: 'coun' was not declared in this scope
                 coun[i][j]=coun[i-1][j]+coun[i-2][j];
                 ^