tuna isa fish . 
0 ###LEFT-WALL### 1 tuna
1 tuna 2 isa
2 isa 3 fish
3 fish 4 .

herring isa fish . 
0 ###LEFT-WALL### 1 herring
1 herring 2 isa
2 isa 3 fish
3 fish 4 .

tuna has fin . 
0 ###LEFT-WALL### 1 tuna
1 tuna 2 has
2 has 3 fin
3 fin 4 .

herring has fin . 
0 ###LEFT-WALL### 1 herring
1 herring 2 has
2 has 3 fin
3 fin 4 .

parrot isa bird . 
0 ###LEFT-WALL### 1 parrot
1 parrot 2 isa
2 isa 3 bird
3 bird 4 .

eagle isa bird . 
0 ###LEFT-WALL### 1 eagle
1 eagle 2 isa
2 isa 3 bird
3 bird 4 .

parrot has wing . 
0 ###LEFT-WALL### 1 parrot
1 parrot 2 has
2 has 3 wing
3 wing 4 .

eagle has wing . 
0 ###LEFT-WALL### 1 eagle
1 eagle 2 has
2 has 3 wing
3 wing 4 .

fin isa extremity . 
0 ###LEFT-WALL### 1 fin
1 fin 2 isa
2 isa 3 extremity
3 extremity 4 .

wing isa extremity . 
0 ###LEFT-WALL### 1 wing
1 wing 2 isa
2 isa 3 extremity
3 extremity 4 .

[fin] [has] [scale] [.] 

wing has feather . 
0 ###LEFT-WALL### 1 wing
1 wing 2 has
2 has 3 feather
3 feather 4 .