Tickling grass

As you all already know, Endo's chance of survival is also affected by other organisms and objects in his environment. One of the organisms that has recently attracted our attention is grass. It turns out that with just a few modifications to Endo's DNA you can make grass grow in completely different places! We have not discovered, however, how to make it grow at the right locations. Take a look at what we tried:

IIPIFFCPICCFPICICFPPICICIPICIIICCCIICIIICCCIIICCCP
IICIPIIICCPIIPIICIIPIPIIICCPIICIIPIICIPIIICCPIICIP
PPCCCFFCCCCCCCCCCCCCCCCCCICIPPCPFCCCFFCCFCCCCCCCCC
CCFFFICIPPCCPCFCFCFFCCCCCFCFFCCCCCCCICIICIIPIFFCPI
CCFPICICFPPICICIPICCIIICICIIICIICCIIICCCPIICIPIIIC
CPIIPIICIIPIPIIICCPIICIIPIICIIPIPIIICCPIICIIPIICIP
IIICCPIICIPPPCCCCFFCCCCCCCCCCCCCCCCCICIPPCPCCFFFCC
FCFFFCCFFFFFFCFFICIPPCCPCFFCFFCCCCFCCCCCFCCCFFFICI
PPCICPCFFFCFFFFFCCCCCCFCCCCCCICIIC

This prefix enables grass repositioning and redefines the function bioMul (see initial conditions help page) as follows:

bioMul x y = bioAdd x y

It seems that the bioMul function influences where grass is going to grow. We are still searching for the right definition of bioMul, and we are confident that when we find it, grass will grow at the right locations. Do you want to help us figure out how to fix bioMul? If you do, you might find it helpful to understand first how bioAdd is encoded in DNA.