What does F-AF stand for?

The results obtained were then statistically analyzed - according to the "t of Student" - in a comparative evaluation of the values between NaFosfomycin-Lisin-Fosfomycin (F-LF); NaFosfomycin-Arginin-Fosfomycin (F-AF); Lisin-Fosfomycin-Arginin-Fosfomycin (LF-AF). From these comparisons, the data found demonstrated no significant differences among the three compounds, for Proteus, Coliforms and Pseudomonas groups, while Salmonella and Staphylococcus Genera showed good differences (P less than 0.