▁ 1 0 7 ▁( 7 4 9 - square ) ▁rectangle . ▁Furthermore , ▁the ▁complete ▁set ▁of ▁free ▁he pt om ino es ▁can ▁tile ▁three ▁ 1 1 ▁by ▁ 2 3 ▁( 2 5 3 - square ) ▁rect angles , ▁each ▁with ▁a ▁one - square ▁hole ▁in ▁the ▁center ; ▁the ▁complete ▁set ▁can ▁also ▁tile ▁twelve ▁ 8 ▁by ▁ 8 ▁( 6 4 - square ) ▁squares ▁with ▁a ▁one - square ▁hole ▁in ▁the ▁" center ". ▁ ▁References ▁ ▁Category : Pol y forms <0x0A> </s> ▁Alan ▁Dun can ▁Mor r ison ▁( born ▁ 1 8 ▁July ▁ 1 9 7 4 , ▁Bright on ) ▁is ▁a ▁British ▁poet . ▁ ▁Over view ▁of ▁works ▁Mor r ison ' s ▁work ▁is ▁influenced ▁by ▁po ets ▁including ▁John ▁David son ▁and ▁Harold ▁Mon ro , ▁and ▁Ang lo - Wel sh ▁po ets ▁Al un ▁Lewis ▁and ▁D yl an ▁Thomas . ▁However , ▁his ▁earliest ▁influ ences ▁were ▁John ▁Ke ats , ▁Wil fred ▁O wen , ▁William ▁Bla ke , ▁Andrew ▁Mar v ell , ▁Em ily ▁Br ont ë ▁and ▁Per cy ▁Sh elle y . ▁▁ ▁His ▁po ems ▁are ▁often ▁character ised ▁by ▁social ▁and ▁po lem ical ▁tra its . ▁▁▁ ▁Mor r ison ▁selected , ▁edited ▁and ▁designed ▁the ▁Collect ed ▁Po ems ▁of ▁David ▁K essel , ▁O ▁the ▁Windows ▁of ▁the ▁Book shop ▁Must ▁Be ▁Bro ken .[ 6 ] ▁Between ▁