) ▁m ast urb ate . ▁ ▁Con stra ints ▁▁ ▁Some ▁O ul ip ian ▁constraints : ▁▁ ▁S + 7 , ▁sometimes ▁called ▁N + 7 ▁ ▁Replace ▁every ▁n oun ▁in ▁a ▁text ▁with ▁the ▁sevent h ▁n oun ▁after ▁it ▁in ▁a ▁dictionary . ▁For ▁example , ▁" Call ▁me ▁I sh ma el . ▁Some ▁years ▁ago ..." ▁becomes ▁" Call ▁me ▁island er . ▁Some ▁y eg gs ▁ago ... ". ▁Results ▁will ▁vary ▁depending ▁upon ▁the ▁dictionary ▁used . ▁This ▁technique ▁can ▁also ▁be ▁performed ▁on ▁other ▁lex ical ▁classes , ▁such ▁as ▁ver bs . ▁▁ ▁Snow ball ▁ ▁A ▁poem ▁in ▁which ▁each ▁line ▁is ▁a ▁single ▁word , ▁and ▁each ▁success ive ▁word ▁is ▁one ▁letter ▁longer . ▁▁ ▁Lip ogram ▁ ▁Writing ▁that ▁ex cludes ▁one ▁or ▁more ▁letters . ▁The ▁previous ▁sentence ▁is ▁a ▁lip ogram ▁in ▁B , ▁F , ▁J , ▁K , ▁Q , ▁V , ▁Y , ▁and ▁Z ▁( it ▁does ▁not ▁contain ▁any ▁of ▁those ▁letters ). ▁▁ ▁Pr ison er ' s ▁constraint , ▁also ▁called ▁Mac ao ▁constraint ▁ ▁A ▁type ▁of ▁lip ogram ▁that ▁om its ▁letters ▁with ▁asc enders ▁and ▁descend ers ▁( b , ▁d , ▁f , ▁g , ▁h , ▁j , ▁k , ▁l , ▁p , ▁q , ▁t , ▁and ▁y ). ▁▁ ▁Pal ind rom es ▁Son net s ▁and ▁other ▁po ems ▁constructed ▁using ▁pal ind rom ic ▁techniques . ▁▁ ▁Un iv