Most people start noticing the effects of altitude somewhere between 4-6,000 ft above sea level.

Do you not notice a contradiction between the penultimate and last sentences ?

I noticed the similarity in patterning and timing between various shows.

The meal seemed to have had a relaxing effect on the group, as Chekov now noticed more interaction between the two parties than before.

Tell me, if you will, who noticed whom first between the two of you?

Then I noticed something else: an oblong drift of snow, halfway between me and the forest wall.

Looking down again, he noticed movement in the stream's clear water, between the stones.

A teaching fellow noticed similarities between a small number of exams during grading in May 2012.

What differences do you notice between the two versions? 3 Make a list of any differences you have noticed.

But she also noticed large and small differences between the Japanese and Americans.