may want to compare this with Figure \[fig:1\].

in l:0.065 w:0.03 t:F h:C v:C em 1.9 (-1 -1.4)(-1 -1)(1 -1.4)(1 -1)(-3.2 -4.5)(1 -1)(-4.9 -4.5)(-1 -1)(3.2 -4.5)(-1 -1)(5.2 -4.5)(1 -1)(-8 -7.5)(-1 -1)(-6.7 -7.5)(1 -2.7)(-2 -7.5)(-1 -1)(-0.3 -7.5)(1 -2.7)(4 -7.5)(-1 -1)(5 -7.5)(0.5 -1)(6 -10.1)(0.25 -0.5)(8 -7.5)(-1 -2.5)(9 -7.5)(1 -1)(-8 -12.6)[$\vdots$]{}(9 -12.6)[$\vdots$]{}(1 -12.6)[$\vdots$]{}(0 0)[${X_1(-1)}^{(2,0)}$]{} (0 -0.7)[$\cdot
{X_2(-2)}^{(1,0)}$]{} (-4 -3)[${X_1(-1)}^{(2,-1)}{X_2(-1)}^{(0,1)}$]{} (-4 -3.7)[$\cdot {X_2(-2)}^{(1,0)}$]{}

(4 -3)[${X_1(-1)}^{(2,0)}$]{} (4 -3.7)[$\cdot {X_2(-2)}^{(1,-1)}{X_3(-2)}^{(0,1)}$]{} (-9 -6)[${X_1(-1)}^{(2,-2)}{X_2(-1)}^{(0,2)}$]{} (-9 -6.7)[$\cdot {X_2(-2)}^{(1,0)}$]{}

(-3.2 -6)[${X_1(-1)}^{(2,-1)}$]{} (-3.2 -6.7)[$\cdot {X_3(-1)}^{(0,1)}{X_2(-2)}^{(1,0)}$]{}

(3 -6)[${X_1(-1)}^{(2,-1)}{X_2(-1)}^{(0,1)}$]{} (3 -6.7)[$\cdot {X_2(-2)}^{(1,-1)}{X_3(-2)}^{(0,1)}$]{}

(9.4 -6)[${X_1(-1)}^{(2,0)}$]{} (9.4 -6.7)[$\cdot {X_2(-2)}^{(1,-2)}{X_3(-2)}^{(0,2)}$]{} (-9.2 -9)[${X_1(-1)}^{(2,-3)}{X_2(-1)}^{(0,3)}$]{} (-9.2 -9.7)[$\cdot {X_2(-2)}^{(1,0)}$]{}

(-7.5 -11)[${X_1(-1)}^{(2,-2)}{X_2(-1)}^{(0,1)}{X_3(-1)}^{(0,1)}$]{} (-7.5 -11.7)[$\cdot {X_2(-2)}^{(1,0)}$]{}

(-2.9 -9)[${X_1(-1)}^{(2,-1)}{X_0(-1)}^{(0,1)}$]{} (-2.9 -9.7)[$\cdot {X_2(-2)}^{(1,0)}$]{}

(1 -11)[${X_1(-1)}^{(2,-1)}{X_3(-1)}^{(0,1)}$]{} (1 -11.7)[$\cdot {X_2(-2)}^{(1,-1)}{X_3(-2)}^{(0,1)}$]{}

(3.8 -9)[${X_1(-1)}^{(2,-2)}{X_2(-1)}^{(0,2)}$]{} (3.8 -9.7)[$\cdot {X_2(-2)}^{(1,-1)}{X_3(-2)}^{(0,1)}$]{}

(9 -11)[${X_1(-1)}^{(2,-1)}{X_2(-1)}^{(0,1)}$]{} (9 -11.7)[$\cdot {X_2(-2)}^{(1,-2)}{X_3(-2)}^{(0,2)}$]{}

(10.5 -9)[${X_1(-1)}^{(2,0)}$]{} (10.5 -9.7)[$\cdot {X_2(-2)}^{(1,-3)}{X_3(-2)}^{(0,3)}$]{} (0 0) (-1.8 -1.5)[$1$]{} (1.8 -1.5)[$2$]{} (0 -2.7) (-5.7 -2.1)[$1$]{} (-2.2 -2.1)[$2$]{} (2.2 -2.1)[$1$]{} (6.1 -2.1)[$2$]{} (0 -6.2) (-9 -1.7)[$1$]{} (-6 -1.7)[$2$]{} (-2.9 -1.7)[$1$]{} (0.2 -1.7)[$2$]{} (3.1 -1.7)[$1$]{} (5.6 -1.7)[$2$]{} (7.5 -1.7)[$1$]{} (9.8 -1.7)[$2$]{} (0 -13.3)

Actually, from property of the crystal structure of $\Me$ we can obtain more general results.

Fix any set of positive integers $p_i$ and any integer $r$. Consider elements of $\Me$ having the form $$\label{extend2}
\begin{aligned}
      M=&{Y_1(r-1)}^{(p_1,a_1^{-1})}{Y_1(r)}^{(0,a_1^0)}
        {Y_1(r+1)}^{(0,a_1^1)}{Y_1(r+2)}^{(0,a_1^2)}\\
        &\cdot {Y_2(r-2)}^{(p_2,a_2^{-2})}{Y_2(r-1)}^{(0,a_2^{-1})}
        {Y_2(r)}^{(0,a_2^0)}{Y_2(r+1)}^{(0,a_2^1)}
\end{aligned}$$ satisfying the same condition 