docs: function parse_string(progression) {
  	var acc = 0,
  		roman_numeral = "",
  		suffix = "",
  		i = 0;
  
  	for (var j = 0; j < progression.length; j++) {
  		var c = progression[j];
  		if(c == '#'){
  			acc += 1;
  		} else if(c == 'b') {
  			acc -= 1;
  		} else if (c.toUpperCase() == 'I' || c.toUpperCase() == 'V') {
  			roman_numeral += c.toUpperCase();
  		} else {
  			break;
  		}
  		i += 1;
  	};
  	suffix = progression.slice(i, progression.length);
  	return [roman_numeral, acc, suffix];
  }