"case and mine is simultaneous." instead of is simultaneous mack should have

are unusual.

are difficult.

are different.

are similar.

Ead this sentence from the evolution of useful things. the underlined phrases indicateaaking waterproof sandpaper would allow wet sanding, which in turn would cut down on dust, and thus be a greatmprovementpassing of timea directional change of positiona cause-and-effect relationshipsequence of events. save and exitmark this and retur