Of all Italy's organised criminal groups, it has proved the most difficult to understand, let alone penetrate.
What she found most difficult to understand was why some people in the Middle East were celebrating the carnage that took place in New York and Washington.
But, the pope added, "Italy's social and cultural identity, and the civilizing mission it has exercised and continues to exercise in Europe and the world, would be most difficult to understand without reference to Christianity, its life blood".
What is most difficult to understand in "Public Schools Minus the Public," by Diane Ravitch and Randi Weingarten (Op-Ed, March 18), is Ms. Weingarten's sudden opposition to our plan to end social promotion of third graders, and her criticisms of our curriculum.
The fragile state of infants requiring chest physiotherapy makes it most difficult to understand and learn the appropriate techniques.
Neurodegenerative diseases are among the most difficult to understand and treat, says Doug Williams, executive vice president of research and development (R&D) at Biogen Idec, a company that focuses on neurodegenerative diseases, including multiple sclerosis, Alzheimer's, and ALS.
It sharpened its investigative focus, and to a remarkable extent, it has shined its light on the darkest, most difficult-to-understand corners of finance.
What we've done is we've created, literally, the world's most difficult-to-understand tax code.
Certainly there are complicated physical illnesses such as cancer, but any neurological or mental illness in general is very (even the most) complicated and difficult to understand and treat.
Lastly, the far-reaching effect of flow on the tissue stroma may be the most complex and difficult to understand.
Several residuals have been proposed, but unfortunately most are rather difficult to understand in the context of survival analyses due to censoring (Collett, 1994).
