PERCENT-ENCODING IN URIs
128 ASCII positions: 66 unreserved, 18 delimiters, 43 that must always be encoded — and the "%" itself
US$2.50
THE UTF-8 ENCODING
how a Unicode code point falls into one, two, three or four bytes — and which bytes never appear
US$2.50
UUID
thirty-six characters: where the version sits, where the variant sits, and what each of the eight versions is made of
US$1.50
VIDEO CARRIERS
nine formats at true scale — and the frame that kept growing after the carrier stopped
US$1.50
VIDEO FORMATS
who published each standard, when, the names it goes by, and what has to be squeezed
US$1.50
VIM COMMANDS
modes, motions and editing per the Vim 9.1 help — and the grammar that composes them into commands
US$2.50
WORD EXPANSION
Four steps in a fixed order — and only two of them can change how many fields reach the command
US$1.50