input question: how do you clean a window?

output answer: spray windex on the window, and use some paper towels to wipe the window until it is clear.

input question: To send a letter in the mail,

output answer: write the destination address on the front, center of the envelope. Place the required amount of postage onto the envelope in the top right corner. Write the return address in the top left corner.

input question: How to charge a mobile phone

output answer:
Using the proper brand adaptor and cord, insert the charger wire into the charging dock of the phone. Allow to charge until nearly 100 percent so as to not wear down the battery.