Dr. David A. Jackson.
First van Kampen diagram for [c,b,a]
Second van Kampen diagram for [c,b,a]
Third van Kampen diagram for [c,b,a]
Fourth van Kampen diagram for [c,b,a]
A van Kampen diagram for [b,a,b,a] preceded by some preliminary diagrams used in its construction
A van Kampen diagram for [c,a,b,a]
A van Kampen diagram for [c,a,a,b,a]
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