$$Erring is human. To err is human. Seeing is believing. To see is to believe.$$

Given above training data, use bigram language model to compare the likelihood of below test sentences. Note: To handle zero probability, use interpolation with weights $0\mathrm{.}3$ & $0\mathrm{.}7$ for unigram and bigram respectively. Don$$t account for punctuation ie$.,.$ for the modelling and predictions.

a$)$ Test Sentence $1$: Seeing is human

b$)$ Test Sentence $2$: To believe is human