The earliest manuscripts had negligible punctuation and breathing marks. The manuscripts also lacked word spacing, so words, sentences, and paragraphs would be a continuous string of letters (scriptio continua), often with line breaks in the middle of words. Bookmaking was an expensive endeavor, and one way to reduce the number of pages used was to save space. Another method employed was to abbreviate frequent words, such as the "nomina sacra". Yet another method involved the palimpsest, a manuscript which recycled an older manuscript. Scholars using careful examination can sometimes determine what was originally written on the material of a document before it was erased to make way for a new text (for example "Codex Ephraemi Rescriptus" and the "Syriac Sinaiticus").