Put the following given words into correct column according to their primary stress.

Stress on the 1^st syllable

Stress on the 2^nd syllable

Stress on the 3^rd syllable

Eg.: portable /ˈpɔːtəbl/

educate /ˈedʒukeɪt/

digital /ˈdɪdʒɪtl/

concentrate /ˈkɒnsntreɪt/

personal /ˈpɜːsənl/

prestigious /preˈstɪdʒəs/

encourage /ɪnˈkʌrɪdʒ/

effective /ɪˈfektɪv/

invalid /ɪnˈvælɪd/

contribute /kənˈtrɪbjuːt/

interact /ˌɪntərˈækt/

incorrect /ˌɪnkəˈrekt/

understand /ˌʌndəˈstænd/

impolite /ˌɪmpəˈlaɪt/

recommend /ˌrekəˈmend/