Neil Ashby Feb 11, 2014:

@ asker have you ever considered literally translating your 1000's of problem questions and then searching to see if they are the equivalent terms?? Obviously not because the last 3 questions (cross line, main lines, piston core) could all have been found in this elementary manner and much quicker than by asking the question. Don't you feel embarrassed to have asked sooooo many straightforward questions?