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Returns the series at its next position.
series [series! gob! port!]
If the series is at its tail, it will remain at its tail. NEXT will not go past the tail, nor will it wrap to the head.
print next "ABCDE" BCDE
print next next "ABCDE" CDE
print next [1 2 3 4] 2 3 4
str: "REBOL" loop length? str [ print str str: next str ] L
blk: [red green blue] loop length? blk [ probe blk blk: next blk ] [blue]
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