Pill test on Swine

"Oh right," Alex said and quickly brought out the pink pills. 

"Wait, don't we need to bring them out somewhere else? What if the pill turns out to be something like a poison that travels through the air or is contagious?" Alex asked.

"Don't worry. There is a formation carved inside each of these cages that will activate the moment they sense something enters these swine," Zhou Mei replied. 

"Ah, I see," Alex said as he sent his spiritual sense behind the pill swine in the cage. There was in fact a formation etched on the metal behind the swine. 

Alex looked at the formation carefully and realized that it was a True rank formation based on the number of strokes in it. Unfortunately, he couldn't really understand what base formations the True rank formation had in it.