It used to be that you could take off the cowling, wrap plastic bags around the electrical stuff (magnetos, regulator, and alternator) and vacuum pump, and blast away with engine degunker.

The site of Ch'ing-lien-kang in Huai-an, Kiangsu, furnishes a good example (17).

The theory suggests, but does not state explicitly, that the prohibition of consecutives is the stricter the nearer the interval in question lies to the fundamental component of a blend.

[H]is VVords vvere ranged vvith more care and leſs confidence than before, and in all his Actions he eſſay'd to beſpeak me an opinion, that the VVorld could not offer him an employment vvhich vvas not leſs important and conſiderable in his thoughts, than the pettieſt occaſion to ſerve and pleaſe me.