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## pangram
### Instructions
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Create a `function` is_pangram which will determine whether or not a string is a pangram.
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A pangram is a sentence which uses every letter of the alphabet at least once.
Example:
"The quick brown fox jumps over the lazy dog."
### Notions
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- [patterns](https://doc.rust-lang.org/book/ch18-00-patterns.html)
### Expected functions
```rust
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pub fn is_pangram(s: &str) -> bool {
}
```
### Usage
Here is a program to test your function.
```rust
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use pangram::*;
fn main() {
println!(
"{}",
is_pangram("the quick brown fox jumps over the lazy dog!")
);
println!("{}", is_pangram("this is not a pangram!"));
}
```
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And its output:
```console
student@ubuntu:~/pangram/test$ cargo run
true
false
student@ubuntu:~/pangram/test$
```