Zaras kerovos chalutoso is assur while kerovas zaros chalutoso is mutar.

A memory device to help remember is as follows:

The last two letters of mutar are taf and raish which are decending numerical values and kerovas zoras, the first letters of each word, are kuf and zadik which are also decending numerical values. My computer does not have loshon kodesh font so it may be hard to understand in english..

Nathan Szyszko