91. What is the keyword used to define an interface in Kotlin?
92. What is the syntax for creating a subclass in Kotlin?
93. How do you define a property in Kotlin that can only be accessed within the same class?
94. What is the keyword used to define a sealed class in Kotlin?
95. What is the keyword used to define an extension function in Kotlin?
96. What is the keyword used to define a type alias in Kotlin?
97. What is the difference between a "var" and a "val" in Kotlin?
98. What is the keyword used to define a companion object in Kotlin?
99. What is the purpose of the "object" keyword in Kotlin?
100. What is the keyword used to define a constructor in Kotlin?
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