Answer: For example, in "There was a rail, a hook, a beam, a brake...", the one-syllable words do create a sense of rhythm while describing several items that only by chance helped some people escape.
In "Because rain fell. Because a shadow fell. Because sunny weather prevailed" there´s an example of assonance, meaning there´s a repetition of vowel sounds with non-rhyming words, that refers to the many different circumstances that became a chance for survival.
Step-by-step explanation:
The theme in this poem refers to the author, and many others, surviving the Holocaust as a matter of luck and good chances. That´s why a poem full of rhymes that usually provide a cheerful tone, would not be suitable in this case. Other sound devices, such as assonance, prevail.