so I have data like this, and I want to make some plots based on it, with y axis represents the mean weight of mice of different days, x-axis represents the time (days), since there are two variables, one is strains , another one is the condition of stress (there are four categories of the combinations of stress train, stress rec1, and stress rec2), I will need to put 8 lines in one plot, I wonder how can I make the ggplot for this? ex. two color used for distinguishing two strains and four types of lines used to represent four combinations of stress condition? I found categorizing those four types combination of stress conditions especially tricky? could anyone help me to write the code for making ggplot of this! thx a lot~