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// Code for lecture [7. Parsing Combinators]
// https://www.youtube.com/watch?v=3Cfq4i6754s&list=PLOech0kWpH8-njQpmSNGSiQBPUvl8v3IM&index=7

import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Deque;
import java.util.HashMap;
import java.util.Scanner;
import java.util.function.Supplier;