Implementation
static UniconData uniEnvelopeBlock = UniconData ( name: 'envelope-block', style: 'line', path: '<path d="M17.5,13.26A5,5,0,1,0,14,11.79,5,5,0,0,0,17.5,13.26Zm2.12-2.88a3,3,0,0,1-3.4.58l4-4A3,3,0,0,1,19.62,10.38ZM15.38,6.14a3,3,0,0,1,2.12-.88,3,3,0,0,1,1.28.3l-4,4A3,3,0,0,1,15.38,6.14Zm5.12,8.12a1,1,0,0,0-1,1v4a1,1,0,0,1-1,1H4.5a1,1,0,0,1-1-1V9.67l5.88,5.88a3,3,0,0,0,2.11.88,3,3,0,0,0,2.16-.91,1,1,0,0,0,0-1.39,1,1,0,0,0-1.43,0,1,1,0,0,1-1.4,0L4.91,8.26H9.5a1,1,0,0,0,0-2h-5a3,3,0,0,0-3,3v10a3,3,0,0,0,3,3h14a3,3,0,0,0,3-3v-4A1,1,0,0,0,20.5,14.26Z"/>');
