import { Observable } from 'rxjs/Observable';
import { NgbActiveModal } from '@ng-bootstrap/ng-bootstrap';
import { FormControl, FormGroup, Validators, ValidationErrors, FormBuilder, ValidatorFn, AbstractControl } from '@angular/forms';
import { Observable } from 'rxjs/Observable';
import { NgbActiveModal } from '@ng-bootstrap/ng-bootstrap';
import { FormControl, FormGroup, Validators, ValidationErrors, FormBuilder, ValidatorFn, AbstractControl } from '@angular/forms';