substitute with list content

i have saw some usages in such a form:

let i=1 | g/foo/s//\="blah_".i/ | let i=i+1

then my question is, what if i wanna substitute something with a list, such as ['one','two','three']

i have try the next script:

let i=0

let alist=['one','two','three']

for n in alist
    g/foo/s//\=n/
endfor

let i=i+1


but all the 'foo' there would be replaced with 'one', not the 'two' or 'three'.

anyone have any ideas?

thanks.

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