im sorry i was born with it ... there are more than 8 types i have 2 of them// example 1# a book pg 633... the soldier grabed his aluminum box and ran for cover ...later it reads.. the soldier grabed his ammunition box and ran for clover..thats funny ha ha 2# print a page on 2 clear sheets 1/2 on 1 sheet 1/2 on the other now move the 2 sheets and try to read it ..boy i git migrians .. i avold reading ... thank god for my franklin speller .... buy being here im working on it... i know i need improvement ..any body got a fix all pill .. i cant pro my cell phone..how ever i can pull strip rebuild a 13 speed roadranger in 1/2 the time the book calls for ... engines trans rears and put 200 hours in a super detailed 18 wheeler they looked good sorry no pics ..i have 20 1st place trophies for archery tounaments with 80 people shooting..i taught it ... there more but thats it for now...((((( time writeing this about 1hour 30 min))