CREATE TABLE "table1_21481509_4" (
  "region" text,
  "population" text,
  "country" text,
  "language" text,
  "n" real,
  "totalpct" text,
  "r1b1c_r_v88" text,
  "r1b1a2_r_m269" text,
  "r1b1c_r_v88" text,
  "r1b1c4_r_v69" text
);

Question: What percentage is listed in column r1b1a2 (r-m269) for the 77.8% r1b1c (r-v88)?
SQL: SELECT "r1b1a2_r_m269" FROM "table1_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 "table1_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 "table1_21481509_4" WHERE "totalpct"='4.5%';

Question: How many n are listed for 0.6% r1b1a2 (r-m269)?
SQL: SELECT COUNT("n") FROM "table1_21481509_4" WHERE "r1b1a2_r_m269"='0.6%';

Question: How many n are listed for berbers from siwa?
SQL: SELECT COUNT("n") FROM "table1_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 "table1_21481509_4" WHERE "r1b1c4_r_v69"='55.6%';