S21A | S20A | S22: el contenido de agua | S31A | S35, S35, S35, S35, S35, S35, S35, S35, S36, S36, S37, S38, S38,
S38, S38, S38, S38, S38, S38, S38, S38, S38, S38, S38, S38, S38,
S38, S38, S38, S38, S38, S38, S38, S38, S38, S38, S38, S38, S38,
S38, S38, S38, S38, S38, S38, S38, S38, S38, S38, S38, S38, S38,
S38, S38, S38, S38, S38, S38, S38, S38, S38, S38, S38, S38, S38,
S38, S38, S38, S38, S38, S38, S38, S38, S38, S38, S38, S38, S38,
S38, S38, S38, S38, S38, S38, S38, | S37 | S37B | S38: el contenido de la sustancia | S39 | S41 | S41A |