Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to make korean sweet potato cake [title] Fill a medium sized stock, soup or multi-cooking pot with 1.5 lbs of korean sweet potatoes (unpeeled). [title] Cover with already hot water (to speed up the boiling process) so that the korean sweet potatoes are resting about one inch below the surface. [title] Bring korean sweet potatoes to a boil and let cook for 25 minutes.

Ending1: [title] Remove from the stove and drain the water from the rice. [title] Divide the rice in four equal parts and set aside for later. Ending2: [title] While the korean sweet potatoes are cooking, cut the sponge cake lengthwise in three parts. [step] Two of these parts will be used to layer the cake and the other will be ground in the mixer. Ending3: [title] Remove very carefully from the heat after 40 minutes. [title] Check to see if the korean sweet potatoes have absorbed enough moisture. Ending4: [title] Turn the rice along with the korean sweet potatoes on a large plate or chopping board. [title] Remove one plus side and remove another plus side of rice.

Answer format: ending1/ending2/ending3/ending4