(b1); (a1) ; (a2) ; (a3) ; (a4) ; (b6) ; (b2) ; (b3) ; (b4) ; (b5) ;

(b1) node\[below=-2.5pt\][[1]{}]{} –(b6)node\[below=-2.5pt\][[5]{}]{}; (a1) –(b2)node\[above=-2.5pt\][[2]{}]{}; (a2) –(b3)node\[below=-2.5pt\][[6]{}]{}; (a3) –(b4)node\[above=-2.5pt\][[3]{}]{}; (a4) –(b5)node\[above=-2.5pt\][[4]{}]{};

;

at ($(6)+(0.1,-.4)$)

(b1); (a1) ; (a2) ; (a3) ; (a4) ; (b6) ; (b2) ; (b3) ; (b4) ; (b5) ;

(b1) node\[below=-2.5pt\][[5]{}]{} –(b6)node\[below=-2.5pt\][[3]{}]{}; (a1) –(b2)node\[above=-2.5pt\][[6]{}]{}; (a2) –(b3)node\[below=-2.5pt\][[4]{}]{}; (a3) –(b4)node\[above=-2.5pt\][[1]{}]{}; (a4) –(b5)node\[above=-2.5pt\][[2]{}]{};

;

($(2)+(8)-(10)$) .. controls +(3,.3) ..($(2)+(8)-(10)+(7)-(6)$)

node \[below,black,-\]

(f2) at (2.46,-.50)

;

(f11) at (4.03,-.50)

;

(f12) at (4.82,-1.90)

;

(f8) at (4.80,-3.40)

;

(f10) at (2.46,-3.40)

; (f2) node \[left=0pt\]

(0,0) node\[above=-2.5pt\][[3]{}]{} – ++(0,-1) coordinate (a1) – +(1,0) node\[right=-2.5pt\][[4]{}]{}; (a1) – ++(0,-1) coordinate (a2) – +(-1,0) coordinate (a5); (a5)–+(135:1) node\[above left=-5pt\][[2]{}]{} ; (a5)–+(-135:1) node\[below left=-5pt\][[1]{}]{} ;

(a2) – ++(0,0) coordinate (a3) ; (a3) – ++(0,-1) coordinate (a4) – +(1,0) node\[right=-2.5pt\][[5]{}]{}; (a4) –+ (0,-1) node\[below=-2.5pt\][[6]{}]{};

–(f11)–(f12)–(f8) node \[right=0pt\]

(0,0) node\[above=-2.5pt\][[3]{}]{} – ++(0,-1) coordinate (a1) – +(1,0) node\[right=-2.5pt\][[4]{}]{}; (a1) – ++(0,-1) coordinate (a2) – +(-1,0) node\[left=-2.5pt\][[2]{}]{}; (a2) – ++(0,-1) coordinate (a3) – +(1,0) node\[right=-2.5pt\][[5]{}]{}; (a3) – ++(0,-1) coordinate (a4) – +(-1,0) node\[left=-2.5pt\][[1]{}]{}; (a4) –+ (0,-1) node\[below=-2.5pt\][[6]{}]{};

–($.5*(f8)+.5*(f10)$) node \[below=-6pt\]

(0,0) node\[right=-2.5pt\][[3]{}]{} – ++(0,-1) coordinate (a1) – +(1,0) node\[right=-2.5pt\][[4]{}]{}; (a1) – ++(0,-1) coordinate (a2) – +(-1,0) node\[left=-2.5pt\][[2]{}]{}; (a2) – 