PARTICIPATION AGREEMENT BY AND AMONG ALLMERICA FINANCIAL LIFE INSURANCE AND ANNUITY COMPANY AND WARBURG, PINCUS TRUST AND CREDIT SUISSE ASSET MANAGEMENT, LLC AND CREDIT SUISSE ASSET MANAGEMENT SECURITIES, INC.Participation Agreement • April 21st, 2000 • Separate Account Kg of Allmerica Fin Life Ins & Annuity Co • New York
