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countLetters("")              # {}

countLetters("xxxx")          # {'x': 4}

countLetters("xXxX")          # {'x': 4}

countLetters("the big house") # {'t': 1, 'h': 2, 'e': 2, ' ': 2, 'b': 1, 'i': 1, 'g': 1, 'o': 1, 'u': 1, 's': 1}

countLetters("1000$")         # {'1': 1, '0': 3, '$': 1}

countBits(0) # 0

countBits(1) # 1

countBits(10) # 2

countBits(1234) # 5

bin2dec(0) # 0

bin2dec(1) # 1

bin2dec(10) # 1010

bin2dec(1234) # 10011010010

console.log(countBits(0));    // 0

console.log(countBits(1));    // 1

console.log(countBits(256));  // 1

console.log(countBits(1234)); // 5

dec2bin(1);    // 1

dec2bin(-1);   // 11111111111111111111111111111111

dec2bin(256);  // 100000000

dec2bin(-256); // 11111111111111111111111100000000

dec2bin(1234); // 10011010010