I understand the requirement regarding no repetition of single words, or variants of them, like SEE, SEES, SAW, SEEN, etc. What about compound words, like ONELANE, ONETERM, ONESIDE, etc? I'm working on an open grid where I would like to have both ONELANE and ONETERM in the same quadrant (they don't cross). I have seen this kind of 'repetition' in NYT crosswords.
What about more obscure pattern repetition, like MADDASH and DASHCAM? I presume there should be no problem with this because DASH has different meanings in the two entries.