def close$\_$far$($a: int, b: int, c:int$)$ bool:

$"""$Return True if one of the varaibles is close to the other and far from the third one. Otherwise return False

$>>>clos{e}_{f}ar(1,2,3)$

$>>>clos{e}_{f}ar(15,7,9)$

$>>>clos{e}_{f}ar(5,17,16)$

$>>>clos{e}_{f}ar(3,4,9)$

#a and $b$ are close:

if $\frac{?}{abs}(a-b)==1$ :

if $\frac{?}{abs}(b-c)2$ :

if $\frac{?}{abs}(a-c)2$ :

return True

#a and $c$ are close:

elif $\frac{?}{abs}(a-c)==1$ :

if $\frac{?}{abs}(b-a)2$ :

if $\frac{?}{abs}(b-c)2$ :

return True

#b and c are close:

elif $\frac{?}{abs}(b-c)==1$ :

if $\frac{?}{abs}(b-a)2$ :

if $\frac{?}{abs}(a-c)2$ :

return True

else:

return False