Double Complementary - Event Decor

[RachelSteinbach]

Hi Everyone! I recently just started the Event Décor Course and am having some issues regarding the color wheel and I see many other students have been too. Assignment B2 asks you show an example of Double Complementary colors. The example the book gives is "Green and Orange with Blue-Green and Red-Orange." At this point I am beyond confused. Blue-Green and Red-Orange ARE complementary where as Green and Orange are not..

Please help if you can! Thanks in Advance
Rachel