Words in a Kinyarwanda sentence interact with each other to allow the words to flow into each other. The most common interaction occurs when a word begins with a vowel and causes the preceding word to drop its final vowel. In some cases this interaction is written explicitly, like in the case of na (e.g. na umugabo should be written n'umugabo), but in other cases the final vowel is retained in the spelling even though it is not pronounced. For example: