Someone once coined the adage, "Write what you know."Â For the past few seasons, we have seen many writers have a lot to say about surviving the Covid lockdown, but none so eloquently as Dave Malloy in "Three Houses." Where there is often the sameness in the stories we've heard thus far, Malloy chooses to give us three not so disparate individuals each with a particular heartbreaking loneliness. All three tales ar…