▁ ▁@ ▁Get ▁rid ▁of ▁the ▁original ▁letter ▁▁ ▁» ▁ ▁This ▁code ▁is ▁identical ▁to ▁the ▁following ▁nested ▁IF / TH EN / EL SE / END ▁block ▁equivalent : ▁▁▁ ▁« ▁▁▁▁▁ ▁IF ▁D UP ▁" A " ▁== ▁▁▁▁▁ ▁THEN ▁▁▁▁▁▁▁▁ ▁" Alpha " ▁▁▁▁▁ ▁ELSE ▁▁▁▁▁▁▁▁▁ ▁IF ▁D UP ▁" B " ▁== ▁THEN ▁▁▁▁▁▁▁▁▁▁▁ ▁" B eta " ▁▁▁▁▁▁▁▁ ▁ELSE ▁▁▁▁▁▁▁▁▁▁▁▁ ▁IF ▁D UP ▁" G " ▁== ▁THEN ▁▁▁▁▁▁▁▁▁▁▁▁▁▁ ▁" Gamma " ▁▁▁▁▁▁▁▁▁▁▁ ▁ELSE ▁▁▁▁▁▁▁▁▁▁▁▁▁▁ ▁" Unknown ▁letter " ▁▁▁▁▁▁▁▁▁▁▁ ▁END ▁▁▁▁▁▁▁▁ ▁END ▁▁▁▁▁▁ ▁END ▁▁▁▁▁ ▁SW AP ▁D ROP ▁ ▁@ ▁Get ▁rid ▁of ▁the ▁original ▁letter ▁▁ ▁» ▁ ▁Loop ing ▁statements ▁ ▁FOR / N EXT ▁R PL ▁provides ▁a ▁FOR / N EXT ▁statement ▁for ▁looping ▁from ▁one ▁index ▁to ▁another . ▁ ▁The ▁index ▁for ▁the ▁loop ▁is ▁stored ▁in ▁a ▁temporary ▁local ▁variable ▁that ▁can ▁be ▁accessed ▁in ▁the ▁loop . ▁ ▁The ▁syntax ▁of ▁the ▁FOR / N EXT ▁block ▁is : ▁▁ ▁index _ from ▁index _ to ▁FOR ▁variable _ name ▁loop _ statement ▁N EXT ▁ ▁The ▁following ▁example ▁uses ▁the ▁FOR ▁loop ▁to ▁sum ▁the ▁numbers ▁from ▁ 1 ▁to ▁ 1 0 . ▁ ▁The ▁index ▁variable ▁of ▁the ▁FOR ▁loop ▁is ▁" I ": ▁▁▁ ▁« ▁▁▁▁▁▁▁ 0 ▁▁▁▁▁▁ ▁@ ▁Start ▁with ▁zero ▁on ▁the ▁stack ▁▁▁▁▁▁ 1 ▁ 1 0 ▁▁▁ ▁@ ▁Loop ▁from ▁ 1 ▁to ▁ 1 0 ▁▁▁▁▁ ▁FOR ▁I ▁▁ ▁@ ▁" I " ▁is ▁the ▁local ▁variable ▁▁▁▁▁▁▁▁