Englishfor English speakers
letter
Noun
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A letter is a symbol which makes up part of a word.
The word fly has 3 letters: f, l and y.
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A letter is a written message or note.
I received a letter through the post.
of
Preposition
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Made using.
It is a house of cards.
instruction
Noun
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An instruction is a command or a step that helps you achieve a goal.
Before he died, he gave the hospital instructions about how to deal with his body.
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The instructions that come with a new machine, computer, or product tell you how to use the product.
I couldn't figure out how to set the temperature in the fridge, so I read the instructions.