[group a][/group] will resolve to a block-level DIV:
<div data-id="a" data-orig_data_id="a" data-class="wpcf7cf_group" class="wpcf7cf-hidden"></div>In some cases you might want to display a group inside a <p> tag or some other HTML element that only allows inline elements, so you may want to add inline to the group, like this:[group a inline][/group], which will resolve to an inline SPAN element:
<span data-id="a" data-orig_data_id="a" data-class="wpcf7cf_group" class="wpcf7cf-hidden"></span>