def unit_to_string (unit, unit_symbols=["m", "s", "kg", "T", "V"]):
    """Transforms from vector representation of a unit to string representation.
    Example: [1, -2, 1, 0, 0] -> 'm1s-2kg1T0V0'
    Arguments:
        unit (list): contains exponents of base units that make up the given unit
        unit_symbols (list): contains the strings representing each base unit. Length should match the length of units.
    Returns:
        (string) 
    """
    return "".join([unit_symbols[i]+str(unit[i]) for i in range(len(unit))])