Write one ML recursive function sumT$2($L$)$ to add all number in a tuple list. ${\displaystyle \underset{?}{\overset{?}{}}}T2([(1,2)])longrightarrow3,{\displaystyle \underset{?}{\overset{?}{}}}T2[(2,3),(5,7)]longrightarrow17$

$0$ type:

la Base in:

$1$ b Base out:

$2$a N in:

$2bN$:

$3$a N$-1$ in:

$3$ b N$-1$:

$4==$

$5$ Together