Mr. Dormer said the killings were "very difficult to comprehend".
High-quality GaN crystals were very difficult to grow.
"They would sit there naked, but they were very difficult to punish," Mr. Htein Lin said.
She learned that gardenias, and camellias, were very difficult to find with their stems attached.
He added that about 30 bodies were "very difficult to identify".
"We had a number of year six boys last year who were very difficult to engage in their learning.
In the documentary about him, Mr. Ellis sort of chokes up, saying the sadistic passages were very difficult to write.
Since these planets are so dim compared with the stars they orbit, they were very difficult to detect directly.
Significant financing for Spanish mosques comes from Saudi Arabia and Morocco, said a Justice Ministry official, but he added that the money trails were very difficult to track.
I also spoke to Pepe Reina, who said that when he played for Liverpool against Watford in 2007 they were very difficult to play against, especially at home, and he said good things about the club and English football.
Brandis also said events such as the shooting in Munich were very difficult to predict and lone gunman who self-radicalise are "the most difficult people to pick up".
