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>perl -wMstrict -le
"my $s = 'x foo1 foo2 x foo3 x yfoo9 foo4 foo5 foo9y x foo6 foo7 x';
...
'x foo1 foo2 x  x yfoo9   foo9y x   x'
'x foo1 foo2 x foo3 x yfoo9   foo9y x   x'
'x foo1 foo2 x foo3 x yfoo9 foo4  foo9y x   x'