@Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        Combination combination = (Combination) o;

        if (!idToPositionMappings.equals(combination.idToPositionMappings)) return false;
        if (!positionToObjectMappings.equals(combination.positionToObjectMappings)) return false;

        return true;
    }