difficult problem
no problem
problem solving
optimization problem
big problem
environmental problem
social problem
scheduling problem
technical problem
practical problem
inverse problem
economic problem
housing problem
academic problem
assignment problem
bottleneck problem
math problem
allocation problem
problem analysis
financial problem
The problem is ongoing.
the problem is not insoluble.
a problem in arithmetic
a problem child; problem customers.
understate a problem
the problem of soil erosion.
an imponderable problem of metaphysics.
the obstinate problem of unemployment.
chew a problem over.
The problem is too elaborate.
The drug problem is international.
The problem is ripe for settlement.
This problem will not work out.
an elementary problem in statistics.
a hypothetical problem
theorise about a problem
couldn't get the problem into focus.
the problem isn't exclusive to Dublin.
Solved problem number one, now to problem number two.
They call the problem " colony collapse disorder."
There are enough problems now without sin.
I've encountered this problem before, my lord.
Behavioral economists approached the problem a little differently.
There is also the problem of smog.
We haven't had any problems so far.
The government should squarely face the problem and take a down-to-earth attitude toward it.
We're having some problems with the budget.
But this isn't simply a both sides problem.
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