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West Hollywood-based Bank of Los Angeles has agreed to merge with Culver City-based Culver National Bank for undisclosed terms, pending shareholder and regulatory approval. . . . Santa Clara-based Bay Networks Inc. has agreed to buy closely held Mountain View computer network technology company Rapid City Communications for $155 million in stock. . . . Palmdale-based computer simulation software maker Simulations Plus Inc. said it has commenced an initial public offering of 1.2 million shares at $5 per share. . . . Travelers Group Inc. unit Smith Barney said it agreed to buy Perkins Shareholder Services, a San Jose company that administers employee stock option programs for corporations, for undisclosed terms.