Best take a look at the Vignettes to understand this format.

eq_tables(game, reduce.tables = TRUE, combine = 2, eq.ind = seq_along(game$eq.li), ignore.keys = NULL, eq.li = game$eq.li[eq.ind], ...)

reduce.tables | (default = TRUE). Shall we try to reduce the rows and columns of the key tables be reduced to get a subset of neccessary keys that perfectly predict the chosen value of an action? |
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combine | if 0 generate separate tables for each equilibrium. If 1 bind the tables of each variable over all equilibria. If 2 (default) also collapse the rows that are the same for different equilibria and add a column eq.inds that contains all equilibrium numbers as a comma separated string |

eq.ind | Vector of integers specifying the indices of all equilibria that shall be considered. By default all equilibria. |

ignore.keys | A character vector of variables that will always be removed from the key variables, without any check whether they are neccessary or not. |