difficult one

They were the difficult ones; everyone else's had been decided months ago.

She said Iraq and the peace process "are two separate issues, clearly very difficult ones."

The years between 1975 and 1980 were difficult ones for the organization.

The years 1813-1815 were difficult and tragic ones for Stock.

Other revolutionary parties have been through even more difficult ones.

His own preference is for 20th-century works - and often difficult ones.

She's sympathetic to all the members of her family, even the difficult ones.

"This is definitely one of the more difficult ones," he said after an hour's work.

Clearly, the last few days had been difficult ones for him.

The early years of the University's existence were difficult ones.