... used so often as a valid reason to justify this claim ... frequently** then the justification is valid. But obviously this is not ... it is at all a valid way of supporting the argument ...
...
If sufficient fails then no valid conclusions about the necessary condition ... hence we can have a valid conclusion.
If necessary ... hence we can have a valid conclusion, but if necessary ... satisfied or affirmed then no valid conclusion.
Hey! Perhaps a silly question, but is there a tool on the drills page to draw things out for LR questions? I have been searching for a pen tool to map things out, but I only have access to highlighters.