3. 7 A of M - Seven Ages of Man (popular name for a poem from "As You Like It", a play by William Shakespeare with the famous first line "All the world's a stage")
4. 7 for a SN to BT - One for sorrow, Two for joy, Three for a girl, Four for a boy, Five for silver, Six for gold, Seven for a secret, never to be told. You are supposed to use this rhyme to make predictions based on the number of magpies that you see.