$=\{$C$,$A$,$G$,$T$\},$ L $=$ L $=\{$ w : w starts and ends with the same symbols; #C$($w$)<=1$; #C$($w$)+1=$ #G$($w$)$

$+$ #T$($w$)$; if w starts with A then #A$($w$)\%2=1\}.$ For example, AAA in L; ACTATA in L; TACT in L; AA $$ L

because it starts with A but has an even number of A$\text{'}$s; ACTATAA $$ L for the same reason; TACG $$ L

because it does not start and end with the same symbol; and w $=$TGCT $$ L because $($#C$($w$)+1)!=$

$($#G$($w$)+$ #T$($w$)).$