Seems also that some points are exactly on top of each so before welding hit 'm' to merge those points together. For the merge to work don't select any points just hit 'm' and click 'ok'.
After merging, if you still have any more of those weird subpatching errors then weld the rest like ozwolf has mentioned.
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Johnny was a chemist's son, but Johnny is no more.
What Johnny thought was H2O was H2SO4.
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