Provide a symbolisation key and symbolise each of the following arguments into Sentential. Make explicit any assumption which the speaker might naturally be expected to make, and note any difficulties or points of interest. (a) It will be sunny on Thursday unless the forecast is wrong. If its sunny, Zhang will be happy. But if the forecast is wrong, he will be cold. So Zhang will be cold if hes not happy. (b) At the end of a game, a player controls a field if they have at least one meeple in the field, and no player has more meeples lying in that field. Angelika will win the game if they alone control the last field; otherwise Barbara will win. No other player has a meeple in the last field, so Angelika wins if she does. Using complete or partial truth tables, please determine whether the arguments you have symbolised in question 6a and 6b are valid entailments in Sentential or not.