\pnode(1.55, 0.9){s6E}{}
\pnode(1.55, 1.9){s5E}{}
\pnode(1.55, 2.9){s4E}{}
\pnode(1.55, 3.9){s23E}{}

\pnode(4.75, 0.9){t6E}{}
\pnode(4.75, 1.9){t5E}{}
\pnode(4.75, 2.9){t4E}{}
\pnode(4.75, 3.9){t23E}{}

\pnode(5.75, 0.9){t6I}{}
\pnode(5.75, 1.9){t5I}{}
\pnode(5.75, 2.9){t4I}{}
\pnode(5.75, 3.9){t23I}{}

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