A $25.0\mathrm{mL}$ sample containing only $\mathrm{NaOH}$ and/or $\mathrm{Na}{}_2\mathrm{CO}{}_3$ and/or $\mathrm{NaHCO}{}_3$ is titrated with $0.100\mathrm{M}$ $\mathrm{HCl}$. The phenolphthalein end point is at $14.0\mathrm{mL}$ and a further $6.0\mathrm{mL}$ is required for the methyl orange end point. Select the correct statement(s).

1. AThe sample contains $0.600$ mmol of $\mathrm{Na}{}_2\mathrm{CO}{}_3$
2. BThe sample contains $0.800$ mmol of $\mathrm{NaOH}$
3. CThe sample contains $\mathrm{NaHCO}{}_3$
4. DThe total $\mathrm{HCl}$ used up to the methyl orange end point is $2.00$ mmol