<b-card-group deck class="mb-3">
    <b-card border-variant="danger" bg-variant="dark" text-variant="white" class="text-center" v-for="b in breakdownNumbers" :key="b"> {{b}}
    </b-card>
  </b-card-group>

data() {
    return {
      bns: []
    }
  }
  methods: {
    addBns (bns) {
        for (var b of bns) {
          if(this.bns.indexOf(b) === -1) {
            this.bns.push(b)
          }
        }
      },