Identify the reagent(s) needed to complete the following reaction scheme. 
Definitions:
Servicing Model
A labor union approach focused on providing services and support to members, such as legal advice, instead of emphasizing collective action.
Organizing Model
A strategy in labor movements focusing on building grassroots support among workers, aiming to increase union membership and worker participation.
Union Representation
The act of labor unions acting as intermediaries between workers and employers, negotiating contracts for better wages, working conditions, and benefits on behalf of their members.
Union Substitution
Practices or strategies employed by an employer to avoid unionization, often by addressing workers' grievances directly and improving working conditions.
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