(70:0.2) and (140:0.2) .. (140:0.5); (70:0.5) .. controls (70:0.2) and (145:0.2) .. (145:0.5); (70:0.5) .. controls (70:0.2) and (150:0.2) .. (150:0.5); (70:0.5) .. controls (70:0.2) and (155:0.2) .. (155:0.5); (70:0.5) .. controls (70:0.2) and (210:0.2) .. (210:0.5); (70:0.5) .. controls (70:0.2) and (205:0.2) .. (205:0.5); (70:0.5) .. controls (70:0.2) and (200:0.2) .. (200:0.5); (70:0.5) .. controls (70:0.2) and (195:0.2) .. (195:0.5);

(125:0.4) arc (125:135:0.4);

(270:0.5) .. controls (270:0.2) and (45:0.2) .. (45:0.5); (270:0.5) .. controls (270:0.2) and (50:0.2) .. (50:0.5); (270:0.5) .. controls (270:0.2) and (55:0.2) .. (55:0.5); (270:0.5) .. controls (270:0.2) and (60:0.2) .. (60:0.5);

(30:0.4) arc (30:40:0.4);

(270:0.5) .. controls (270:0.2) and (25:0.2) .. (25:0.5); (270:0.5) .. controls (270:0.2) and (20:0.2) .. (20:0.5); (270:0.5) .. controls (270:0.2) and (15:0.2) .. (15:0.5); (270:0.5) .. controls (270:0.2) and (10:0.2) .. (10:0.5);

(10:0.5) .. controls (0:0.25) and (300:0.25) .. (290:0.5); (290:0.5) .. controls (300:0.25) and (-10:0.25) .. (0:0.5); (0:0.5) .. controls (-10:0.26) and (310:0.26) .. (300:0.5); (300:0.5) .. controls (310:0.28) and (-20:0.28) .. (-10:0.5); (-10:0.5) .. controls (-20:0.3) and (320:0.3) .. (310:0.5);

(330:0.45) – (330:0.35);

(0,0) circle(0.5cm);

at (220:0.65) [$a_1$]{}; (220:0.5) node\[fill=white,circle,inner sep=0.065cm\] circle (0.02cm); at (130:0.65) [$a_2$]{}; (130:0.5) node\[fill=white,circle,inner sep=0.065cm\] circle (0.02cm); at (35:0.65) [$a_3$]{}; (35:0.5) node\[fill=white,circle,inner sep=0.065cm\] circle (0.02cm); 