Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to make gluten free bread [title] Combine the brown rice flour, tapioca flour/starch, cornstarch, and potato flour. [step] To have a gluten-free flour blend ready for your bread, mix the ingredients together before you start making the dough. Set aside.

Ending1: [substeps] If you aren't able to find potato flour at the store, you can use instant mashed potato flakes. Pulverize them in a blender or food processor several times to give them a light, flour-like texture. Ending2: [title] In a small bowl, put together the flour, baking powder, and baking soda. [step] Mix well with a wooden spoon or fork. Ending3: [substeps] You don't need to separate the flour from the tapioca flour, but stirring the two ingredients together will help them combine properly. It will also help you to turn the dough around a bit to make sure it is evenly combined. Ending4: You'll need about 1/3 cup of brown rice flour, enough to create your bread dough. [substeps] In a heavy bag, mix brown rice flour, cornflour, and potato flour together until well mixed.

Answer format: ending1/ending2/ending3/ending4