```
context("test-gcd")
test_that("examples", {
x <- rational_chord(matrix(c(4, 5, 6,
1, 1, 1),
nrow = 2, byrow = TRUE))
expect_equal(bowl18:::gcd(x), fraction(c(1, 1)))
x <- rational_chord(matrix(c(3, 4, 5,
2, 3, 4),
nrow = 2, byrow = TRUE))
expect_equal(bowl18:::gcd(x), fraction(c(1, 12)))
})
```

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