1- For `Here's a `: The singular verb form ’s does not seem to agree with the plural subject a few common cases where you might want to try something else. Consider changing the verb form.

2- Added `A` before Reasonably : The noun phrase Reasonably good configuration seems to be missing a determiner before it. Consider adding an article. An article (a, an, or the) is a type of determiner. Possessive adjectives (my, his, our), possessive nouns (Joe’s, mother’s), and quantifiers (each, every) are also determiners. Single countable nouns usually require a determiner.