Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to infuse vodka with coffee [title] Boil the water in a medium saucepan. [title] Lower the heat to medium and stir in the sugar, stirring with a wooden spoon until the sugar has dissolved. [title] Add the vanilla extract and boil for another 3 to 5 minutes.

Ending1: [title] Gradually add the urushiol and boil for a further 7 minutes. [title] After 3 minutes are over, reduce the heat and cover the saucepan. Ending2: [step] This will help the syrup to thicken. [title] Set the saucepan aside and allow the syrup to cool. Ending3: [title] Pour in the reserved vodka and stir it into the sugar-syrup mixture. [title] Take the pan off the heat once all the sugar has dissolved. Ending4: [title] Remove the ice cube tray and let the mixture cool. [title] Add the vanilla and sugar mixture back into the water mixture.

Answer format: ending1/ending2/ending3/ending4