Contributors declare the two languages they mix, then write as they would message a friend who speaks both, switching inside the sentence, not between paragraphs. Monolingual text, sentence-boundary switching and anything translated are refused, and the brief tells people not to force it. Recruitment is confined to 11 Southeast Asian countries, where Taglish, Indonesian-English and Malay-English mixing is the ordinary way to text; three pieces per author at most, each tagged with its language pair. A large share of the world texts in two languages at once and almost none of it reaches training data, because it rarely appears in published text.