Every signal hides a single word; your work is to recover it and carry it to the keyhole. Nothing here says which signal hides which way — only the ways a word can hide. The rest is yours to notice.
Every recovered word carries a two-letter check, stamped on its signal. It never gives a word away — it only confirms one, so you may guess freely and stay honest. To read a check yourself, number the letters A = 0 through Z = 25:
If your word's two letters match the signal's stamp, you have it.
Some signals strike certain letters and set a small hand by each. A hand may lean you to a neighbour — kept within the word, or ranging through the alphabet. Read only what is struck.
Number the words of a page. A coordinate names one word and one letter of it — taken from an end, or counted from its head. Read the letters they choose, in order.
A word can stand in the first letters of the lines, or the last, or step corner to corner down them. When the middle says nothing, read the edges.
A page shows you one thing; its source, its notes left for machines, and the addresses it keeps out of sight hold another. Read the page beneath the page.
An image can carry a message in its smallest bits; a sound can carry a picture in its frequencies. Look — do not only listen.
The hardest marks are two at once: one hand finds a letter, the other turns it. Learn each hand alone, and the pair comes clear.
Two of these hands — the marks and the coordinates — are the Society's own inventions. The Pocket Primers teach them properly, with graduated practice and hidden puzzles of their own.