Table of Contents

Latex Version of Equations

eq 1
$$\left[\begin{array}{c}
  x_{\rm new}^P(x,y,z)\\ 
  y_{\rm new}^P(x,y,z)\\ 
  z_{\rm new}^P(x,y,z)\end{array}\right] = [\quad D(P)\quad ] 
  \left[\begin{array}{c}
  x\\    y\\    z \end{array}\right] ~ , $$


eq 2
$$P \, f (x,y,z) \equiv f \left(x_{\rm new}^P(x,y,z), ~ 
   y_{\rm new}^P(x,y,z), ~ z_{\rm new}^P(x,y,z) \right) = g(x,y,z) ~ . $$


eq 3
$$Q\,P\,f (x,y,z) \equiv Q\,g (x,y,z)= h(x,y,z) ~ , $$


eq 4
 \begin{eqnarray*}
\left[ \begin{array}{c}
  x_{\rm new}^{QP}(x,y,z)\\ ~\\
  y_{\rm new}^{QP}(x,y,z)\\
  z_{\rm new}^{QP}(x,y,z) \end{array}\right] 
&=& Q\,P \left[\begin{array}{c}
x\\  y \\ z\end{array} \right] = Q[\quad D(P)\quad ] 
  \left[\begin{array}{c}
  x\\  y\\ z \end{array}\right] 
= [\quad D(P)\quad ]  Q \left[\begin{array}{c}
  x\\  y\\ z \end{array}\right] \\
&=& [\quad D(P)\quad ] ~ [\quad D(Q)\quad ] ~
  \left[\begin{array}{c}
  x\\ y\\ z \end{array}\right] ~ .  \end{eqnarray*} 


eq 5
 \begin{eqnarray*}
\left[ \begin{array}{c}
  (yp_z - zp_y)_{\rm new}\\ ~\\
  (zp_x - xp_z)_{\rm new}\\
  (xp_y - yp_x)_{\rm new} \end{array}\right] 
= P \left[\begin{array}{c}
(yp_z - zp_y)\\  
 (zp_x - xp_z)\\ 
 (xp_y - yp_x)\end{array} \right] = [ ~ D^{F_1}(P) ~ ] 
  \left[\begin{array}{c}
  (yp_z - zp_y)\\  
  (zp_x - xp_z)\\ 
   (xp_y - yp_x)\end{array}\right] ~ , \end{eqnarray*} 


eq 6
 \begin{eqnarray*}
\left[ \begin{array}{c}
  (2z^2-x^2-y^2)_{\rm new}\\ ~\\
  \sqrt{3}(x^2 - y^2)_{\rm new} \end{array}\right] 
= P \left[\begin{array}{c}
(2z^2-x^2-y^2)\\  
 \sqrt{3}(x^2 - y^2) \end{array} \right] = [ D^E(P) ] 
  \left[\begin{array}{c}
  (2z^2-x^2-y^2)\\  
  \sqrt{3}(x^2 - y^2)\end{array}\right] ~ ,\end{eqnarray*} 


eq 7
 \begin{eqnarray*}
\left[ \begin{array}{c}
  f\\    g\\    h\end{array}\right] 
= [ \quad U \quad ] \left[\begin{array}{c}
  x\\    y\\    z\end{array}\right] ~ , \end{eqnarray*} 


eq 8
$$\left[\begin{array}{c}
 (\mbox{\boldmath $R$}_1)_{\rm new} \\
 (\mbox{\boldmath $R$}_2)_{\rm new} \\
 (\mbox{\boldmath $R$}_3)_{\rm new} \end{array}\right] = (123) 
  \left[\begin{array}{c}
  (\mbox{\boldmath $R$}_1)\\  ~\\
  (\mbox{\boldmath $R$}_2)\\  ~\\
  (\mbox{\boldmath $R$}_3) \end{array}\right] =   \left[\begin{array}{c}
  (\mbox{\boldmath $R$}_2)\\  ~\\
  (\mbox{\boldmath $R$}_3)\\  ~\\
  (\mbox{\boldmath $R$}_1) \end{array}\right] ~ .$$


eq 9
$$\mbox{\boldmath $R$}_i = 
\mbox{\boldmath $R$}+S^{-1}(\chi\theta\phi) 
(\mbox{\boldmath $a$}_i+\mbox{\boldmath $d$}_i) ~ .$$


eq 10
\begin{eqnarray*}
&~& \qquad\qquad X \qquad\qquad\qquad\qquad Y \qquad\qquad\qquad Z \\
\begin{array}{r}
                     x\\ 
S(\chi\theta\phi) = y\\ 
                    z \end{array} &~&
\left[\begin{array}{ccc}
  c\chi \, c\theta \, c\phi -s\chi \, s\phi 
& c\chi \, c\theta \, s\phi +s\chi \, c\phi  
& -c\chi \, s\theta\\
  -s\chi \, c\theta \, c\phi -c\chi \, s\phi 
& -s\chi \, c\theta \, s\phi +c\chi \, c\phi  
& s\chi \, s\theta\\
  s\theta \, c\phi 
& s\theta \, s\phi 
& c\theta\end{array} \right] ~ , \end{eqnarray*} 


eq 11
\begin{eqnarray*}
\Sigma_i m_i (\mbox{\boldmath $R$}_i - \mbox{\boldmath $R$}) &=&\mbox{\boldmath $0$}\\
\Sigma_i m_i \mbox{\boldmath $a$}_i \times S(\chi\theta\phi) \cdot 
(\mbox{\boldmath $R$}_i - \mbox{\boldmath $R$}) &=&\mbox{\boldmath $0$} ~ .
\end{eqnarray*}


eq 12
$$(\mbox{\boldmath $d$}_i)_{\rm new} = M ~\mbox{\boldmath $d$}_j ~ , $$


eq 13
$$\mbox{\boldmath $a$}_j = M^{-1} ~\mbox{\boldmath $a$}_i ~ ,   $$


eq 14
$$S(\chi_{\rm new} , \theta_{\rm new} , \phi_{\rm new})= M~S(\chi , \theta , \phi) ~ , $$


eq 15
$$\mbox{\boldmath $R$}+S^{-1} (\chi\theta\phi) M^{-1} 
(\mbox{\boldmath $a$}_i + M\mbox{\boldmath $d$}_j) =  
\mbox{\boldmath $R$}+S^{-1} (\chi\theta\phi)
(\mbox{\boldmath $a$}_j + \mbox{\boldmath $d$}_j) ~ .$$


eq 16
$$(\mbox{\boldmath $d$}_i)_{\rm new} = N~\mbox{\boldmath $d$}_j ~ ,$$


eq 17
$$\mbox{\boldmath $a$}_j = N^{-1}~\mbox{\boldmath $a$}_i ~ , $$


eq 18
$$S(\chi_{\rm new} , \theta_{\rm new} , \phi_{\rm new})= -N~S(\chi , \theta , \phi) ~ , $$


eq 19
$$-\mbox{\boldmath $R$}~-\!S^{-1}(\chi\theta\phi) \, 
N^{-1} (\mbox{\boldmath $a$}_i + N \,\mbox{\boldmath $d$}_j) =  
-\mbox{\boldmath $R$}~-\!S^{-1}(\chi\theta\phi) \, 
(\mbox{\boldmath $a$}_j + \mbox{\boldmath $d$}_j) ~ . $$


eq 20
\begin{eqnarray*}
S_1 &=& 4^{-1/2} (\delta r_1 + \delta r_2 + \delta r_3 + \delta r_4)\\
S_{2a}&=&12^{-1/2} (2\delta\alpha_{12} + 2\delta\alpha_{34} - \delta\alpha_{13} 
                 - \delta\alpha_{24} - \delta\alpha_{23} - \delta\alpha_{14})\\
S_{2b}&=& 4^{-1/2} (\delta\alpha_{13} + \delta\alpha_{24} - \delta\alpha_{23} 
                 - \delta\alpha_{14})\\
S_{3x}&=& 4^{-1/2} (+\delta r_1 - \delta r_2 + \delta r_3 - \delta r_4)\\
S_{3y}&=& 4^{-1/2} (-\delta r_1 + \delta r_2 + \delta r_3 - \delta r_4)\\
S_{3z}&=& 4^{-1/2} (+\delta r_1 + \delta r_2 - \delta r_3 - \delta r_4)\\
S_{4x}&=& 2^{-1/2} (\delta\alpha_{13} - \delta\alpha_{24})\\
S_{4y}&=& 2^{-1/2} (\delta\alpha_{23} - \delta\alpha_{14})\\
S_{4z}&=& 2^{-1/2} (\delta\alpha_{12} - \delta\alpha_{34}) ~ ,
\end{eqnarray*}


eq 21
\begin{eqnarray*}
\delta r_i &=& (\mbox{\boldmath $a$}_i/a) \cdot 
(\mbox{\boldmath $d$}_i-\mbox{\boldmath $d$}_{\rm C})\\
\delta\alpha_{ij} &=&- \, {\scriptstyle{1\over4}} \sqrt{2} \, 
\left[ \frac{(\mbox{\boldmath $a$}_i/a) \cdot 
(\mbox{\boldmath $d$}_i-\mbox{\boldmath $d$}_{\rm C})}{a} + 
\frac{(\mbox{\boldmath $a$}_j/a) \cdot 
(\mbox{\boldmath $d$}_j-\mbox{\boldmath $d$}_{\rm C})}{a} \right]^{\phantom I}\\
&~&- \, {\scriptstyle{3\over4}} \sqrt{2} \, \left[ \frac{(\mbox{\boldmath $a$}_i/a) \cdot 
(\mbox{\boldmath $d$}_j-\mbox{\boldmath $d$}_{\rm C})}{a} + 
\frac{(\mbox{\boldmath $a$}_j/a) \cdot 
(\mbox{\boldmath $d$}_i-\mbox{\boldmath $d$}_{\rm C})}{a}\right]^{\phantom I} ~ , \end{eqnarray*}


eq 22
$${\mit\Gamma}(v_1, v_2, v_3, v_4) = [A_1^{v_1}] \times [E^{v_2}]
\times [F_2^{v_3}] \times [F_2^{v_4}] ~ , $$


eq 23
$$\left[\begin{array}{c}
 J_x\\  J_y\\  J_z \end{array}\right] = 
 \left[\begin{array}{ccc}
 +\cos\chi \cot\theta & \sin\chi & -\cos\chi \csc\theta \\ 
 -\sin\chi \cot\theta & \cos\chi & +\sin\chi \csc\theta \\ 
             +1       &	0	 &  0 \end{array}\right] 
 \left[\begin{array}{c}
 p_\chi\\   p_\theta\\   p_\phi  \end{array}\right] ~ ,  $$


eq 24
$$\left[\begin{array}{c}
 J_X\\  J_Y\\  J_Z \end{array}\right] = [S^{-1}(\chi\theta\phi)] 
\left[\begin{array}{c}
 J_x\\  J_y\\  J_z \end{array}\right] ~ . $$


eq 25
$$\left[\begin{array}{c}
 J_X\\  J_Y\\  J_Z \end{array}\right] = 
 \left[\begin{array}{ccc}
 +\csc\theta \cos\phi & -\sin\phi & -\cot\theta \cos\phi \\ 
 +\csc\theta \sin\phi & +\cos\phi & -\cot\theta \sin\phi \\ 
             0       &	0	 & +1 \end{array}\right] 
 \left[\begin{array}{c}
 p_\chi \\   p_\theta \\   p_\phi  \end{array}\right] ~ .$$


eq 26
$|kJm\rangle = [(2J + 1)/8\pi^2]^{1/2} ~ 
{\cal D}_{km}^{(J)}(\{\chi\theta\phi\}) ~ ,$


eq 27
$$| K^\pm Jm\rangle = 2^{-1/2} \, [\,|KJm\rangle \pm | -KJm\rangle] ~ ,$$


eq 28
$$\left[\begin{array}{c}
  x_{\rm new} \\    
  y_{\rm new} \\     
  z_{\rm new} \end{array}\right] = [ S(\alpha\beta\gamma) ] 
  \left[\begin{array}{c}
  x\\   y\\   z \end{array}\right] ~ .$$


eq 29
$S(\chi_{\rm new},\theta_{\rm new},\phi_{\rm new}) = 
   S(\alpha\beta\gamma) \cdot S(\chi\theta\phi) ~ .$


eq 30
${\cal D}^{(1)}(\{\chi\theta\phi\}) = U\cdot S(\chi\theta\phi) 
\cdot U^{-1} ~ ,$


eq 31
$$ U = 2^{-1/2} ~ \left[ \begin{array}{rrr}
  1 & +{\rm i} & 0 \\
  0 & 0        & \sqrt{2} \\
 -1 & +{\rm i} & 0 \end{array} \right] ~ . $$


eq 32
${\cal D}^{(J)}(\{\chi_{\rm new},\theta_{\rm new},\phi_{\rm new}\}) = 
           {\cal D}^{(J)}(\{\alpha\beta\gamma\}) \cdot
           {\cal D}^{(J)}(\{\chi\theta\phi\}) ~ ,$
           


eq 33
$$R_{\alpha\beta\gamma} \, |kJm\rangle = \sum_{k^\prime}~ 
{\cal D}^{(J)}_{kk^\prime} \, (\{\alpha\beta\gamma\}) \, 
|k^\prime Jm\rangle ~ ,$$


eq 34
\begin{eqnarray*}
(234) \, | m_a m_b m_c m_d\rangle &\equiv & 
(234) \, | m_a(1), m_b(2), m_c(3), m_d(4)\,\rangle\\
	&=& \phantom{(234)} \, | m_a(1), m_b(3), m_c(4), m_d(2)\,\rangle \equiv
	| m_a m_d m_b m_c\rangle ~ . \end{eqnarray*}


eq 35
$$ \left[ \begin{array}{c}
  \mu_x\\   \mu_y\\   \mu_z \end{array}\right] = 
 \left[ \begin{array}{c}
 ~\\ S(\chi\theta\phi) \\
 ~ \end{array}\right]  
  \left[\begin{array}{c}
  \mu_X \\   \mu_Y \\   \mu_Z \end{array}\right] ~ .$$


eq 36
$$ \left[ \begin{array}{c}
L_{sx} \\ L_{sy} \\ L_{sz}  \end{array}\right] = 
 \left[ \begin{array}{c}
 Q_{sy} P_{sz} - Q_{sz} P_{sy}\\
 Q_{sz} P_{sx} - Q_{sx} P_{sz}\\
 Q_{sx} P_{sy} - Q_{sy} P_{sx}\end{array}\right] ~ , $$


eq 37
$(u^1_{10}) \cdot (u^1_{01}) = 
           (u^1_{11}) \cdot [(u^1_{00}) - \sqrt{3} (u^0_{00})] ~ .$


eq 38
$$ \left[ \begin{array}{c}
Q_{sx} \\ Q_{sy} \\ Q_{sz}  \end{array}\right] \equiv Q_s
 \left[ \begin{array}{l}
 \sin\theta_s \, \cos\phi_s\\
 \sin\theta_s \, \sin\phi_s\\
 \cos\theta_s \end{array}\right] ~ ,    $$


eq 39
$$ \left[ \begin{array}{c}
L_{sx} \\ L_{sy} \\ L_{sz}  \end{array}\right] = 
 \left[ \begin{array}{ccc}
 +\csc\theta_s \, \cos\phi_s & -\sin\phi_s & -\cot\theta_s \, \cos\phi_s \\
 +\csc\theta_s \, \sin\phi_s & +\cos\phi_s & -\cot\theta_s \, \sin\phi_s  \\
               0          & 0    & +1  \end{array}\right] ~ 
 \left[ \begin{array}{c}
  0 \\   P_{\theta_s} \\    P_{\phi_s}   \end{array}\right] ~  , $$


eq 40
$$|L \, k_L \rangle = [(2L+1)/4\pi]^{1/2} \, 
   {\cal D}_{0k_L}^{(L)}\, (\{0\, \theta_s \phi_s  \}) ~ , $$


eq 41
$$R_{\alpha\beta\gamma} ~ \left[ \begin{array}{c}
Q_{sx} \\ Q_{sy} \\ Q_{sz}  \end{array}\right]  = 
\left[ \begin{array}{c}
 ~\\ S(\alpha\beta\gamma) \\~  \end{array}\right] ~
 \left[ \begin{array}{c}  
Q_{sx} \\   Q_{sy} \\   Q_{sz}  \end{array}\right] ~ . $$


eq 42
\begin{eqnarray*}
R_{\alpha\beta\gamma}[Q_{sx}, Q_{sy}, Q_{sz}] 
&=& R_{\alpha\beta\gamma}[\sin\theta_s\cos\phi_s,\sin\theta_s\sin\phi_s,\cos\theta_s]\,Q_s\\
&=& R_{\alpha\beta\gamma}[0 \, 0 \, 1 ] \cdot S(\chi_s \theta_s \phi_s) \cdot Q_s\\ 
&=& [0 \, 0 \, 1 ] \cdot S(\chi_s \theta_s \phi_s) \cdot S^{\rm tr}(\alpha\beta\gamma) \cdot Q_s 
~ . \end{eqnarray*}


eq 43
$$ R_{\alpha\beta\gamma}\,S(\chi_s\theta_s\phi_s) 
=  S(\chi_s\theta_s\phi_s) \cdot S^{\rm tr}(\alpha\beta\gamma) ~ ,$$


eq 44
$${\cal D}_{\mu^\prime\mu}^{(j)} (\{\alpha\beta\gamma\}) =
  (-1)^{\mu-\mu^\prime} ~ {\cal D}_{-\mu^\prime-\mu}^{(j)*} 
  (\{\alpha\beta\gamma\}) ~ ,$$


eq 45
$$R_{\alpha\beta\gamma}~
{\cal D}_{k^{\prime\prime}k_L}^{(L)} (\{\chi_s\theta_s\phi_s\})=  
\sum_{k_L^\prime}~{\cal D}_{k^{\prime\prime}k_L^\prime}^{(L)}
(\{\chi_s\theta_s\phi_s\}) \, (-1)^{k_L^\prime-k_L} ~ 
{\cal D}_{-k_L-k_L^\prime}^{(L)} (\{\alpha\beta\gamma\}) ~ . $$


eq 46
$$R_{\alpha\beta\gamma}~ |L\, k_L\rangle =  \sum_{k_L^\prime} \,
(-1)^{k_L^\prime-k_L} ~ 
{\cal D}_{-k_L-k_L^\prime}^{(L)} (\{\alpha\beta\gamma\}) ~ 
|L\, k_L^\prime\rangle ~ . $$


eq 47
$$|\tilde{L} \, \tilde{k}_L\rangle \equiv (-1)^{k_L} \,
[(2L+1)/4\pi ]^{1/2} ~ {\cal D}_{0\,k_L}^{(L)} (\{0\, \theta_s\, \phi_s\}) =
(-1)^{k_L} \, |L\, k_L\rangle ~ ,$$


eq 48
 $$R_{\alpha\beta\gamma}~ |\tilde{L} \, \tilde{k}_L \rangle = 
  \sum_{\tilde{k}_L^\prime} ~ {\cal D}_{\tilde{k}_L \tilde{k}_L^\prime}^{(L)} \,
   (\{\alpha\beta\gamma\}) ~ |\tilde{L} \, \tilde{k}_L^\prime \rangle ~ ,$$


eq 49
\begin{eqnarray*}
(\theta_s)_{\rm new} &=& \pi - \theta_s\\
(\phi_s)_{\rm new} &=& \pi + \phi_s ~ .    \end{eqnarray*}


eq 50
$$\mbox{\boldmath $R = J - L$}_s = \mbox{\boldmath $J + \tilde{L}$}_s   $$


eq 51
\begin{eqnarray*}   
{\cal H}_{\rm r} &=& B[\mbox{\boldmath $J$} - \zeta_s\mbox{\boldmath $L$}_s]^2\\
     &=& B[\mbox{\boldmath $J$} + \zeta_s\mbox{\boldmath $\tilde L$}_s]^2\\ 
     &=& B[\mbox{\boldmath $J$}^2 + \zeta_s^2\mbox{\boldmath $\tilde L$}_s^2 
     + 2\zeta_s \, \mbox{\boldmath $J \cdot \tilde L$}_s] ~ , \\ 
   s &=& 3 \, {\rm or} \, 4 \end{eqnarray*}


eq 52
$$B \{J(J+1) + \tilde{L}_s(\tilde{L}_s +1) \, \zeta_s^2 + 
  \zeta_s [R(R+1) - J(J+1) - \tilde{L}_s(\tilde{L}_s +1)\,]\,\} ~ . $$


eq 53
$$\left[\begin{array}{c}
 \mu_X \\ \mu_Y \\ \mu_Z \end{array} \right] = (\partial\mu / \partial Q_s )
\left[\begin{array}{c}
 ~ \\   S^{-1} (\chi \theta \phi ) \\ ~\end{array} \right] 
\left[\begin{array}{c}
Q_{sx} \\  Q_{sy} \\  Q_{sz} \end{array} \right] ~ , $$


eq 54
\begin{eqnarray*}
\Delta v_3 ~ {\rm or} ~ \Delta v_4 &=& \pm 1 \\
             \Delta R = \Delta k_R &=& 0 ~ . \end{eqnarray*}


eq 55
$$\left[\begin{array}{c}
(R_{iX})_{\rm new} \\ (R_{iY})_{\rm new} \\ (R_{iZ})_{\rm new} \end{array} \right] = 
\left[\begin{array}{c}
~\\  S^{-1}(\alpha\beta\gamma) \\  ~\end{array} \right] 
\left[\begin{array}{c}
R_{iX} \\ R_{iY} \\R_{iZ} \end{array} \right] ~ . $$


eq 56
$$S^{-1}(\chi_{\rm new},\theta_{\rm new},\phi_{\rm new}) = 
   S^{-1}(\alpha\beta\gamma) \cdot S^{-1}(\chi\theta\phi) ~ .   $$


eq 57
$$R_{\alpha\beta\gamma} \, |kJm\rangle = \sum_{m^\prime}~ 
{\cal D}^{(J)}_{m^\prime m} \, (\{\alpha\beta\gamma\}) \, 
|kJm^\prime\rangle ~ .   $$


eq 58
$$(j_1 j_2 m_1 m_2 \, | \, j_1 j_2\,j\,m) \equiv
           C (j_1 j_2 j\,;\,m_1 m_2 m) ~ . $$


eq 59
$$| j_1 j_2\,j\,m \rangle = \sum_{m_1 m_2} ~ | j_1 m_1\rangle \, 
            | j_2 m_2\rangle \, (j_1 j_2 m_1 m_2 \, | \, j_1 j_2\,j\,m) ~ . $$


eq 60
$$| J\,m\,\tilde{L}\,R\,k_R \rangle = 
        \sum_{k\,\tilde{k}_L} ~ |k\,J\,m\rangle \, 
       | \tilde{L}\,\tilde{k}_L \rangle \, 
       (J \tilde{L}\,k\,\tilde{k}_L \, | \, 
        J \tilde{L}\,R\,k_R) ~ . $$


eq 61
$$| J\,\tilde{L}\,R\,k_R\,\Gamma\,I\,F\,m_F \rangle = 
        \sum_{m\,m_I} ~ |J\,m\,\tilde{L}\,R\,k_R\,\rangle ~ 
       | \Gamma\,I\,m_I \rangle \, 
       (J\,I\,m\,m_I \, | \, J\,I\,F\,m_F\,) ~ .    $$


eq 62
$$J_i J_j - J_j J_i = -i\hbar \, e_{ijk} J_k ~ . $$


eq 63
\begin{eqnarray*}
{\cal H}_{\rm cent. \, dist.} = -D_J \mbox{\boldmath $J$}^4 
   &-& {\textstyle{1\over2}} \, D_t \left[ 3\mbox{\boldmath $J$}^4  
   - 30\mbox{\boldmath $J$}^2 J_z^2 + 35 J_z^4 
   - 6\mbox{\boldmath $J$}^2 + 25J_z^2 \right .\\
   &+& \left .{\textstyle{5\over2}} (J_x+iJ_y)^4 
   + {\textstyle{5\over2}} (J_x-iJ_y)^4 \right] ~ . \end{eqnarray*}


eq 64
$$(2 \cdot 5 \cdot 7)^{1/2} \, f_0^{(4)} + 
           5 \left[f_{+4}^{(4)}+f_{-4}^{(4)} \right] ~ .   $$


eq 65
$$h_m^{(k)} = \sum_{m_1 m_2} \, f_{m_1}^{(k_1)} \, g_{m_2}^{(k_2)} 
   (k_1 k_2 m_1 m_2 \, | \, k_1 k_2 k \, m ) $$


eq 66
$$\langle\Psi_{m_1}^{(j_1)}| \, O_{m_3}^{(j_3)} \, |\Psi_{m_2}^{(j_2)}\rangle  
= \langle j_1| |O^{(j_3)}| |j_2\rangle \, (j_2 j_3 m_2 m_3 \, | \, j_2 j_3 j_1 m_1)  
~ . $$

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