Statistics for Rivers Chain

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Hint	River	% Correct
Longest in US	Mississippi	100%
National river of Pakistan	Indus	89%
Largest by discharge	Amazon	86%
Two bordering African countries named for it	Niger	86%
Second-longest in central Europe	Rhine	86%
One of Mesopotamia's rivers	Euphrates	81%
Shares name with African country	Senegal	70%
One of Pittsburgh's three rivers	Ohio	62%
Short-named Russian river	Ob	59%
Starts near Lake Baikal	Lena	51%
Second-longest tributary of Mississippi	Arkansas	41%
Spanish color, tributary of Amazon	Negro	41%
Namesake of western New York city	Buffalo	35%
Named after Chinese dynasty	Han	32%
Drains into same-named valley in Virginia and West Virginia	Shenandoah	19%
Location of Three Mile Island	Susquehanna	11%
Second longest in Alaska	Kuskokwim	3%
Siberian river 1.400 miles long	Olenyok	3%