source: [lemma=be] [lemma=require] [lemma=□] □
destination: [lemma=be] [lemma=require] [lemma=to] □
spec: A full and explicit enumeration of benefits of inclusion and exclusion is required to assure that maximum benefits are achieved at minimum cost . The employer is required to assure that no employee is exposed to lead at concentrations in excess of the PEL of fifty micrograms of lead per cubic meter of air ( 50 ug / m ( 3 ) ) . That said , manufacturers recommend you never low-level format a hard drive . The researchers used laser light shining through a 2 micrometer-square piece of silicon suspended by a pair of 200-nanometer-thick silicon beams to allow the silicon to vibrate at a precise frequency in air , the way that it would vibrate in a vacuum without the laser light . If the worker has received a severe acute exposure , hospitalization may be required to assure proper medical intervention . Because of the critical conditions , such as the deep and ultradeep waters and low fracture gradients , great precision is required to assure gravel-packing success . when no extrajudicial source is involved . And this strong federal govt is required to assure all US citizens basic rights and what-not , regardless of state of residence . Sen. Ted Stevens ( R-AK ) stated that this amendment `` would allow small rural areas to get wireless service '' , and that without this amendment , some communities in the state of Alaska will remain without wireless services .