return {
    basic        = require("radical.item_style.basic"        ),
    classic      = require("radical.item_style.classic"      ),
    rounded      = require("radical.item_style.rounded"      ),
    arrow_alt    = require("radical.item_style.arrow_alt"    ),
    arrow_prefix = require("radical.item_style.arrow_prefix" ),
    arrow_single = require("radical.item_style.arrow_single" ),
}