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which the principles of the alpha part of
the system render permissible shall be
termed alpha permissible transformations,
and in general I shall use “alpha”
freely as a prefix so signify a reference
to these principles. Thus, I shall say
that the alpha-signs, that is to say the
signs of this system heretofore described
apart from the graphs themselves[,] are
two, and there are besides two peculiar
graphs. Namely, the two peculiar graphs
are the blank place which asserts only what is
already well-understood between us to be true,
and the blot which asserts something well
understood to be false. The two signs