Before revision:  Using unsupervised word embeddings, we tracked the longitudinal change in the latent space of the lexical categories in five countries with strong vaccine roll-out programs, i.e. India, USA , Brazil, UK , and Australia.
After revision:  Using unsupervised word embeddings, we tracked the longitudinal change in the latent space of the lexical categories in five countries with vital vaccine roll-out programs, i.e. India, USA , Brazil, UK , and Australia.