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fix typo: 'can used' -> 'can be used' (#559)
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@@ -414,7 +414,7 @@ impl Writer {
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This method clears a row by overwriting all of its characters with a space character.
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## A Global Interface
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To provide a global writer that can used as an interface from other modules without carrying a `Writer` instance around, we try to create a static `WRITER`:
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To provide a global writer that can be used as an interface from other modules without carrying a `Writer` instance around, we try to create a static `WRITER`:
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```rust
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// in src/vga_buffer.rs
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