Both have uses beyond tax avoidance, which makes the taxman's task doubly difficult.

ECONOMIST: Who benefits from a one-off levy on bankers�� bonuses?

This task is made doubly difficult by the fact that economic security for one stakeholder is often considered a security threat to another.

FORBES: Alternative Energy And Global Energy Security In Aftermath Of Rio+20

That will be doubly difficult because they will lose star players who have county contracts, including keeper Niall O'Brien, batsman Eoin Morgan and bowler Boyd Rankin.

BBC: SPORT | Cricket | Windies need dash of Irish spirit

Hein, a 34-year-old computer trainer who is attempting the doubly difficult feat of getting rich off a Web site and a catchphrase at the same time.

FORBES: Shark Attack

Also, spotting unwanted visitors with lights on their cars is at least doubly difficult with the Targa roof open, and that could be truly hazardous to your Porsche driving pleasure.

FORBES: Test Drives

Lehman's public relations campaign is made doubly difficult by the public critiques of a well-known investment manager, David Einhorn of Greenlight Capital, who has taken a short position in the stock, which means he will profit if it falls.

FORBES: Lehman Doesn't Need The Money

Cross-border mergers are doubly difficult.

ECONOMIST: Folie de grandeur

Predicting behavioural change is notoriously difficult, doubly so when the intervention is aimed at something such as drinking that the public are clearly so attached to.

BBC: The battle over alcohol pricing

It is an example worth emulating for curators of architecture exhibitions and of drawings alike: The combination of a difficult medium and subject makes such contextual materials doubly necessary.

WSJ: Masterpieces on a Shopping List | Michelangelo Master Drawings | Museum of Fine Arts Boston | By Cammy Brothers