Question: What percentage is listed in column r1b1a2 (r-m269) for the 77.8% r1b1c (r-v88)?
SQL: SELECT "R1b1a2 (R-M269)" FROM "1-21481509-4" WHERE "R1b1c (R-V88)" = '77.8%';

Question: What languages are spoken in Niger with r1b1c (r-v88) of 0.0%?
SQL: SELECT "Language" FROM "1-21481509-4" WHERE "Country" = 'Niger' AND "R1b1c (R-V88)" = '0.0%';

Question: What percentage is listed in column r1b1c (r-v88) for the 4.5% total percentage?
SQL: SELECT "R1b1c (R-V88)" FROM "1-21481509-4" WHERE "Total%" = '4.5%';

Question: How many n are listed for 0.6% r1b1a2 (r-m269)?
SQL: SELECT COUNT("N") FROM "1-21481509-4" WHERE "R1b1a2 (R-M269)" = '0.6%';

Question: How many n are listed for Berbers from Siwa?
SQL: SELECT COUNT("N") FROM "1-21481509-4" WHERE "Population" = 'Berbers from Siwa';

Question: What is the largest n value for 55.6% r1b1c4 (r-v69)?
SQL: SELECT MAX("N") FROM "1-21481509-4" WHERE "R1b1c4 (R-V69)" = '55.6%';