Ben Petermann

Change singleton pattern counter class

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Hi, the counter class gave me the following error messages: - counter is not defined - After initialization (this.counter = 0) "counter is read-only" Removing Object.freeze and returning the instance...

Missing Function Declarations in Solution to Exercise 2.65

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In the solution to [Exercise 2.65](https://sourceacademy.org/sicpjs/2.3.3#ex-2.65) "intersection_set_as_tree" from chapter 2.3.3, the function declarations for `entry`, `left_branch`, `right_branch`, and `make_tree` are missing. This omission leads to the following error: ```mathematica Line...