print$(\text{'}--$ Test $1--\text{'})$

a $=$ set$([1,2,10,11])$

b $=$ set$([2,5,8,10])$

c $=$ set$([1,2,5,8])$

assert not check$\_$sum$\_$exists$($a$,$ b$,$ c$,12),$ f'Failed Test $1$: your code returned true when the expected answer is false'

print$(\text{'}$Passed$\text{'})$

print$(\text{'}--$ Test $2--\text{'})$

a $=$ set$([1,2,10,11])$

b $=$ set$([2,5,8,10])$

c $=$ set$([1,2,5,8,11])$

assert check$\_$sum$\_$exists$($a$,$ b$,$ c$,12),$ f'Failed Test $2$: your code returns false but note that $1$ in a $+10$ in b $=11$ in c $\text{'}$

print$(\text{'}$Passed$\text{'})$

print$(\text{'}--$ Test $3--\text{'})$

a$=\{1,4,5,7,11,13,14,15,17,19,22,23,24,28,34,35,37,39,42,44\}$

b$=\{0,1,4,9,10,11,12,15,18,20,25,31,34,36,38,40,43,44,47,49\}$

c$=\{3,4,5,7,8,10,19,20,21,24,31,35,36,37,38,39,42,44,46,49\}$

assert check$\_$sum$\_$exists$($a$,$ b$,$ c$,50),$ f'Failed Test $3$: your code returns False whereas the correct answer is true eg$.,4+0=4\text{'}$

print$(\text{'}--$ Test $4--\text{'})$

a$=\{98,2,99,40,77,79,87,88,89,27\}$

b$=\{64,66,35,69,70,40,76,45,12,60\}$

c$=\{36,70,10,44,15,16,83,20,84,55\}$

assert not check$\_$sum$\_$exists$($a$,$ b$,$ c$,100),$ f'Failed Test $4$: your code returns True whereas the correct answer is False'

print$(\text{'}$All Tests Passed $(15$ points$)!\text{'})$