===good============ mary.what2eat <- navel orange
YAP query succeed
pMary.what2eat <- pRalphs.fruitprice(P:[..2.000000])
pRalphs.fruitprice(0.50) <- 'navel orange'

===good============ mary.what2eat <- kiwi
YAP query succeed
pMary.what2eat <- pRalphs.fruitprice(P:[..2.000000])
pRalphs.fruitprice(1.50) <- 'kiwi'

===bad============ bob.what2eat <- navel orange
YAP query failed

===good============ ralphs.fruitprice(1.50) <- apple
YAP query succeed
pRalphs.fruitprice(1.50) <- 'apple'

===bad============ ralphs.fruitprice(1.50) <- green apple
YAP query failed