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### What data type represents a special value meaning 'no value'?

### What data type represents a variable that has been declared but not yet assigned a value?

### What data type is used to list multiple data items of the same type in order?

### What keyword is used to declare a variable that cannot be reassigned?

### What is the scope of a variable declared with var?

### What keyword is used in JavaScript to declare a block-scoped variable that can be reassigned?

### What keyword is used in JavaScript to declare a variable that cannot be reassigned once a value is set?