February 2019 1HaskellADay Problems and Solutions

• February 20th, 2019: Wednesday's #haskell problem: we've got words, now let's find words that start with ... 'x'. 
• February 19th, 2019: Tuesday's #haskell problem: now that we have a word finder, let's pretty-print the results! 
• February 18th, 2019: Monday's #haskell problem is to come up with sets of wordsusing only a set of supplied letters. Monday's #haskell solution has some trickiness around empty sets: this, we call 'fun.'