How to filter through a table using ng-repeat checkboxes with Angularjs

Once upon a time this was working but somehow it's broken. I want to be able to produce checkboxes using ng-repeat to get as many checkboxes as required based on stored data and use these to filter through a table produced.

Additionally I don't want identical values for the checkboxes to be repeated.

I have made a plnkr with the code.

<div class="row">
    <label data-ng-repeat="x in projects">
        <input
        type="checkbox"
        data-ng-true-value="{{x.b}}"
        data-ng-false-value=''
        ng-model="quer[queryBy]" />
        {{x.b}}
    </label>
</div>

http://ift.tt/1fsyJlR

So in summary.

1.) Checkboxes to filter 'Ref'.

2.) Checkboxes to be unique.

3.) Checkboxes to be made based off ng-repeat using 'Ref'.