8316 + 4144 -6230 + 8676 + 8657

(a)  

8860 -4434 +4695 +2465 +5658

(a)  

6745 +4762 -5754 +5762+ 2494

(a)  

3903 +4240 -4072 +2123 + 8048

(a)  

1968 + 5687 -3828 + 5004 + 5515

(a)  

6060 + 1866 -3963 + 3514 + 8800

(a)  

6926 +7401 -7164 +4704 +4211

(a)  

2863+ 6187 + 7884 -7036 +6540

(a)  

1942+ 5488 -3715+ 5125 +8814

(a)  

4494+ 3243 -3869+ 9051+ 2606

(a)  

6624+ 6397 +1330+ 6850 -4090

(a)