//let ind = this.state.indSelected
        //if (ind >= 0 && this.state.dest === dest) {
        //    if (dest === 1) {  // move to the right
        //        let val = this.state.paraLeft[ind], aux = [...this.state.paraLeft]; // make a separate copy of the array
        //        aux.splice(ind, 1)  // remove the element from the array copy
        //        this.setState({
        //            paraRight: this.state.paraRight.concat(val),
        //            paraLeft: aux,
        //            indSelected: -1,
        //            dest: -1
        //        })
        //    }
        //    else {  // move to the left
        //        let val = this.state.paraRight[ind], aux = [...this.state.paraRight]; // make a separate copy of the array
        //        aux.splice(ind, 1)  // remove the element from the array copy
        //        this.setState({
        //            paraLeft: this.state.paraLeft.concat(val),
        //            paraRight: aux,
        //            indSelected: -1,
        //            dest: -1
        //        })
        //    }
        //}