{!! html()->label('System Requirements')->for('system_requirments')->class('form-label') !!}
<select class="form-control" name="system_requirments[]" id="system_requirments_dropdown" multiple>
    @foreach ($systems as $system)
        @foreach ($system->requirements as $requirement)
            <option value="{{ $requirement->id }}" @if (is_array($selected_requirements) && in_array($requirement->id, $selected_requirements)) selected @endif >
                ({{ $system->name }}) - {{ $requirement->no }} - {{ $requirement->name }}
            </option>
        @endforeach
    @endforeach
</select>