Swedish Leftists Hold Narrow Edge That Could Be Upset by Mail Votes
Social Democratic and Communist opposition parties hold 1-seat lead in elections for Parliament, but thin margin could be overtaken by governing non-Socialist bloc when 38,000 mail ballots are counted; Social Democrats and Communists together have 175 seats in Riksdag to 174 for non-Socialist Moderate, Center and Liberal parties; Erland Von Hofsten, former head of National Bureau of Statistics, statistician Prof Jurgen Westerstohl and former Prime Min Olof Palme comment; illus of Palme and wife Lisbeth casting ballot, Stockholm (L)
