 \camel\toucan\seal \begin {array} { l } \hat { \partial } _ i \hat { \partial } _ j = q ^ { - 1 } \hat { \cal R } ^ { l k } _ { j i } \hat { \partial } _ k \hat { \partial } _ l ~ , \\ \hat { \partial } _ i \partial _ j = q \hat { \cal R } ^ { l k } _ { j i } \partial _ k \hat { \partial } _ l ~ . \end {array}