internal Substitution Append(Substitution substitution) { substitution.Previous = this; return(substitution); }
internal Substitution Append(Substitution substitution) { substitution.Previous = this; return substitution; }
internal Substitution Append(Substitution substitution) { substitution.Previous = this; return(substitution); }
internal Substitution Append(Substitution substitution) { substitution.Previous = this; return substitution; }