Need help with macro

I have this block of text:

START
aaaa
bbb
cccc
END

I try to record a macro that perform substitutions between START and END.
Say, I need to replace aaaa with ee and cccc with ff. Cursor is at START.
I do visual selection and then search replace :<,>s
My problem is macro execution terminates on search item not found. Because
aaaa is not on every h yukl/jhgv .x/ g ,mfndkw

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