How to get values of 20 selectOneMenus

[Yas El]

I have 20 Selectitems, and I want to store the selected values into a list ( in the Managed Bean )

Page.jsf

<c:forEach var="i" begin="1" end="20" step="1" varStatus ="status"> 
              <p:selectOneMenu value="#{Bean.maValeur(????????)}" >
                    <f:selectItems value="#{ConnectionBean.allO}"/>
                    </p:selectOneMenu> 
                            <br></br>
          </c:forEach>  

What should I put instead of (???)

bean.java

 private List<String> maValeur;

public List<String> getMaValeur() {
        return maValeur;
    }
 
    public void setMaValeur(String maValeur) {
        this.maValeur.add(maValeur);
    }

Thanks by advance