st: loop for graphs

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hi to everyone,

i guess this is simple, but i still have not found the right ways to
do it. I have 3 dependent variables (a1,b1,c1) that i want plot
against 1 var (x). i will be using scatter plot and  hope to use these
commands

foreach var of varlist a1-c1 {
graph twoway (scatter `var' x ) (lfit `var' x), saving(gr.gph)
}

with those line, i will only get the last graph but no the other 2
graphs. i would like to have 3 separate scatterplots (a1 vs x), (b1 vs
x) and (c1 vs x), with these graphs have different filename or at
least combined in a single graph.

Please, this is simple but i really need help.

Thank you

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