\puffin \llama\platypus \seahorse \lion\hippo \begin{array}{c}\langle e_{a_{k}...a_{1}} \mid = (\mid e_{a_{1}...a_{k}}\rangle)^{+}\\\langle e_{a_{k}...a_{1}} \mid e_{b_{1}...b_{k}}\rangle = \delta_{a_{1}b_{1}}...\delta_{a_{k}b_{k}}\end{array}