What does it mean that one snail sings to ten snails in the fortune-telling of the seven fairy sisters?

(First of all, several snails refer to several circled fingerprints. ) One snail sits on a stick (sitting on a stick: I think it means sitting and doing nothing all day), two snails walk around (running around all day), three snails have food to do (this needs no translation), four snails have food to do, five snails grow strong in five fields (the grain is abundant), six snails are sad (the heart is bad), and seven snails have seven benefits (the heart is bad).

Ps: I saw this somewhere else, so I cut it. It's my fault if there is any mistake. There is still controversy about the heartbreak of those six snails. Some people say it's a bad heart, while others say it's a lot of troubles all day.