Just checking some I's & E's, found these available.
e41.org
e47.org
e67.org
e75.org
i46.org
And some x's:
x45.org
x63.org
x73.org
x82.org
x95.org
m's & b's:
m41.org
m49.org
m71.org
m74.org
m76.org
m79.org
m93.org
b41.org
b48.org
b63.org
b85.org
b93.org
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