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!pip install ht;
!pip install future;
!pip install fipy
import numpy as np # linear algebra
import pandas as pd # data processing, CSV file I/O (e.g. pd.read_csv)
from fipy import Variable, FaceVariable, CellVariable, Grid1D, ExplicitDiffusionTerm, TransientTerm, DiffusionTerm, Viewer
from fipy.tools import numerix
from scipy.special import erf # doctest: +SCIPY