Union
$$A \cup B =$$
{ incline, lever, logopoeia, melopoeia, phanopoeia, pulley, screw, wedge, wheel }
Symmetric Difference
$$A \ominus B =$$
{ incline, lever, logopoeia, melopoeia, phanopoeia, pulley, screw, wedge, wheel }
Difference
$$B - A =$$
{ incline, lever, pulley, screw, wedge, wheel }
Cartesian Product
$$A \times B =$$
{ (logopoeia, incline),
(logopoeia, lever),
(logopoeia, pulley),
(logopoeia, screw),
(logopoeia, wedge),
(logopoeia, wheel),
(melopoeia, incline),
(melopoeia, lever),
(melopoeia, pulley),
(melopoeia, screw),
(melopoeia, wedge),
(melopoeia, wheel),
(phanopoeia, incline),
(phanopoeia, lever),
(phanopoeia, pulley),
(phanopoeia, screw),
(phanopoeia, wedge),
(phanopoeia, wheel) }