The lack of a digital single market is one of the top two difficulties (together with access to capital) mentioned by entrepreneurs all over Europe and a cause why they take their business to the US.
On top of their difficulty, the Goldbergs are terrifyingly clean.
So on top of the difficulty of trying to identify likely voters, they also have to contend with other sources of bias - such as non-response bias.
The standoff over the Yemeni detainees comes on top of other difficulties that have emerged since President Obama announced his intention to close the prison that has drawn international criticism for years.
In a 1961 Gramophone assessment of Hatto's LP of Rachmaninoff's Second Piano Concerto, the conductor Trevor Harvey wondered "whether her technique is really on top of the difficulties of this music".
But the difficulties top Democrats were experiencing in securing votes in both the House and the Senate illustrated the intensifying power of spending as a campaign issue and real concerns among lawmakers about the consequences of the growing debt.
This year the torch is passing from Abdullah Badawi, the prime minister, to Najib Razak, his deputy, who is standing uncontested as UMNO leader and due to be sworn in as Malaysia's sixth prime minister next week.But his ascension to the top has its difficulties.
On top of the difficulties any bill to overhaul immigration would confront with unemployment near 10 percent, the near-term obstacles became clear on Friday when Mr. Graham pointedly reiterated a warning that an immigration bill would be "the first casualty" if Democrats adopt health care legislation by an expedited process that circumvents Republican votes.
On top of these difficulties, from what we know of Gongsun Long, we should expect the text to trade in semantic ambiguity and to slip in a category mistake or two, the more to baffle and entertain the audience.
However, on top of the difficulties outlined by the police, the freegordon website detailed a number of what Park's supporters claim are holes in the evidence used to convict him.
