s2_cell_union(x = list())## S3 method for class 's2_cell_union'as_s2_geography(x,...)as_s2_cell_union(x,...)## S3 method for class 's2_cell_union'as_s2_cell_union(x,...)## S3 method for class 's2_cell'as_s2_cell_union(x,...)## S3 method for class 'character'as_s2_cell_union(x,...)