)
	testCases = append(testCases,
		testCase{gen1, "fooaaabar", "foo3[aaa]b1[a]r"},
		testCase{gen1, "long, longerst, longer", "short, most long, medium"},
		testCase{gen1, "xxxxx", "xxxxX"},
		testCase{gen1, "XiX", "YiY"},
		testCase{gen1, "", ""},
	)

	// gen2 has multiple old strings with no pairwise common prefix.
	gen2 := NewReplacer(
		"roses", "red",
		"violets", "blue",
		"sugar", "sweet",
	)

thing, being useful for understanding the next part of this Book, was
here to be set down. And for the same reason I add the two following
Propositions.


PROP. XIX.

_If any sort of Rays falling on the polite Surface of any pellucid
Medium be reflected back, the Fits of easy Reflexion, which they have at
the point of Reflexion, shall still continue to return; and the Returns

reflected or transmitted at their subsequent Incidence upon any other pellucid Medium. Which thing, being useful for understanding the next part of this Book, was here to be set down. And for the same reason I add the two following Propositions. PROP. XIX. _If any sort of Rays falling on the polite Surface of any pellucid Medium be reflected back, the Fits of easy Reflexion, which they have at the point of Reflexion, shall still continue to return; and the Returns shall be at distances from the point...