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  1. myOp[Plus[f_, g_]] := myOp[f] + myOp[g]
  2. myOp[a_ f_[x_, t_]] := a myOp[f[x, t]]
  3. myOp[D[f_[x_, t_], {x_, n_}]] := Derivative[n, 0][myOp[f[x, t]]][x, t]
  4. SetAttributes[myOp, Constant]
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