Premise:
"Islamabad, Riyadh and, by extension, Washington may yet come to regret their reported support for a Sunni movement that apparently now exceeds Shiah Iran in its fundamentalist zeal and potential appeal to discontented Sunni populations."
Hypothesis: Washington did not support the Sunnis.

no

Premise:
"If the profits from the money making routes and non-delivered mail exceed the upstream fixed cost, then there must be an offset of money losing routes."
Hypothesis: There are no profits on any routes.

no

Premise:
"A cloud of arrows hissed upwards, all fortunately too late."
Hypothesis: The arrows were too late when they hissed.
yes