class Client void Main Context context new Context var expression new

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class Client
{
void Main()
{
Context context = new Context();
var expression = new NonterminalExpression();
expression.Interpret(context);
}
}
class Context
{
}
abstract class AbstractExpression
{
public abstract void Interpret(Context context);
}
class TerminalExpression : AbstractExpression
{
public override void Interpret(Context context)
{
}
}
class NonterminalExpression : AbstractExpression
{
AbstractExpression expression1;
AbstractExpression expression2;
public override void Interpret(Context context)
{
}
}