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()1 2*(b)
2*(b+c)
(.).1 2*(.b).
2*(.b)
2*(b).
[]1 2*[b]
2*[b+c]
[.].1 2*[.b].
2*[.b]
2*[b].
{}1 2*{b}
2*{b+c}
{.}.1 2*{.b}.
2*{.b}
2*{b}.
&e2 (a>0)&e(a<1)
|e2 (a>0)|e(a<1)




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