- the following order and number of prepcheck buttons should be used wherever an "18-button prepcheck" is recommended. Do not use the older order of buttons. For all uses the 18 prepcheck buttons now are: suppressed, careful of, didn't reveal, not-ised, suggested, mistake been made, protested, anxious about, decided, withdrawn from, reached, ignored, stated, helped, altered, revealed, asserted, agreed (with). (HCOB 14 Aug 64)