Problem $1$ Part A:

Consider the following regular expressions:

letter $=|x|y|z|$

LETTER $=W|x|Y|Z|$

digit $=0|1|2|3|$

$=(()**)**(()**|)(()**|)($ digit $|)$

For each of the following fill in the blank with belonging $(in)$ or does not belong $(!in)($recall that $L(R)$ for regular expression $R$ is the language of $R).$

$36Yx--L()$

$0y10--L()$

$1xwwxy12w---L()$

$0xYZ--L()$

$YZ31xxx--L()$

Write belongs or does not belong for the five fill in the blanks in Problem $1$ in the following format $36Yx$ belongs $/$ does not belong alpha$)$