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Table 10: 

Supertags for Wh-words tend to be rare or unseen in training. Here, MLP_10 correctly identifies that it cannot predict the true category for “why” and instead outputs ¡UNKNOWN¿, while MLP_1 chooses an incorrect tag. The constructive taggers are able to generate the correct category.

Whyconstructive?
Gold S[wq]/(S[adj]∖ NP) S[adj]∖ NP  
MLP_10 ¡UNKNOWN¿ ✓  
MLP_1 (S/ S)/(S[adj]∖ NP) ✓  
K+19 ✓ ✓  
RNN ✓ ✓  
AddrMLP ✓ ✓  
Whyconstructive?
Gold S[wq]/(S[adj]∖ NP) S[adj]∖ NP  
MLP_10 ¡UNKNOWN¿ ✓  
MLP_1 (S/ S)/(S[adj]∖ NP) ✓  
K+19 ✓ ✓  
RNN ✓ ✓  
AddrMLP ✓ ✓  
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