 i,j:
i,j: ||x||.
||x||.
 is-send(E)(x[i])
is-send(E)(x[i]) 
 
 
 is-send(E)(x[j])
is-send(E)(x[j]) 
 (x[j] =msg=(E) x[i])
 (x[j] =msg=(E) x[i]) 
 loc(E)(x[i]) = loc(E)(x[j])
 loc(E)(x[i]) = loc(E)(x[j]) 
 i = j
 i = j i,j:
i,j: ||y||.
||y||.
 is-send(E)(y[i])
is-send(E)(y[i]) 
 
 
 is-send(E)(y[j])
is-send(E)(y[j]) 
 (y[j] =msg=(E) y[i])
 (y[j] =msg=(E) y[i]) 
 loc(E)(y[i]) = loc(E)(y[j])
 loc(E)(y[i]) = loc(E)(y[j]) 
 i = j
 i = j x
x x.(
x.( y
y y.
y. (x =msg=(E) y)))
(x =msg=(E) y))) ||z||
||z|| ||z||
||z|| is-send(E)(z[i])
is-send(E)(z[i]) is-send(E)(z[j])
is-send(E)(z[j]) z[i] = x[i]
 z[i] = x[i] as,bs:T List, i:
as,bs:T List, i: ||as||. (as @ bs)[i] = as[i]
||as||. (as @ bs)[i] = as[i]None
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