fipyrebla lujvo

x1 is a tail with tailed-fish x2.


In notes:

fipfepri
fi1 is a gill of fish fe2=fi1 of species x3=fi2.
fipybirka
b1 is a fin of fish x2=f1 of species x3=f2.
jacyfepri
fi1 is a gill of animal fe2=fi1 of species x3=fi2