a1=217=18*12+1; -215=-18*12+1;
a2=42=4*12-6;-54=-4*12-6;
a3=182=15*12+2;-178=-15*12+2
a4=241=20*12+1;-239=-20*12+1
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a1=217=18*12+1; -215=-18*12+1;
a2=42=4*12-6;-54=-4*12-6;
a3=182=15*12+2;-178=-15*12+2
a4=241=20*12+1;-239=-20*12+1