What is the correct order to watch the DC television crossover (Arrow, flash legends of tomorrow and Supergirl)?

Arrow S01

Arrow S02

The Flash S01E01

Arrow S03E01

The Flash S01E02

Arrow S03E02

The Flash S01E03

Arrow S03E03

Constantine S01E01

The Flash S01E04

Arrow S03E04

Constantine S01E02

Arrow S03E05

Constantine S01E03

The Flash S01E05

Arrow S03E06

Constantine S01E04

The Flash S01E06

Arrow S03E07

Constantine S01E05

The Flash S01E07

Constantine S01E06

The Flash S01E08

Arrow S03E08

Constantine S01E07

The Flash S01E09

Arrow S03E09

Constantine S01E08

Constantine S01E09

The Flash S01E10

Arrow S03E10

Constantine S01E10

The Flash S01E11

Arrow S03E11

Constantine S01E11

The Flash S01E12

Arrow S03E12

Constantine S01E12

The Flash S01E13

Arrow S03E13

Constantine S01E13

The Flash S01E14

Arrow S03E14

Arrow S03E15

The Flash S01E15

Arrow S03E16

The Flash S01E16

Arrow S03E17

The Flash S01E17

Arrow S03E18

The Flash S01E18

Arrow S03E19

The Flash S01E19

Arrow S03E20

The Flash S01E20

Arrow S03E21

The Flash S01E21

Arrow S03E22

The Flash S01E22

Arrow S03E23

The Flash S01E23

The Flash S02E01

Arrow S04E01

The Flash S02E02

Arrow S04E02

The Flash S02E03

Arrow S04E03

Supergirl S01E01

The Flash S02E04

Arrow S04E04

Supergirl S01E02

The Flash S02E05

Arrow S04E05

Supergirl S01E03

The Flash S02E06

Arrow S04E06

Supergirl S01E04

The Flash S02E07

Arrow S04E07

Supergirl S01E05

Supergirl S01E06

The Flash S02E08

Arrow S04E08

Supergirl S01E07

The Flash S02E09

Arrow S04E09

Supergirl S01E08

Supergirl S01E09

Supergirl S01E10

The Flash S02E10

Arrow S04E10

Legends of Tomorrow S01E01

Supergirl S01E11

The Flash S02E11

Arrow S04E11

Legends of Tomorrow S01E02

Supergirl S01E12

The Flash S02E12

Arrow S04E12

Legends of Tomorrow S01E03

Supergirl S01E13

The Flash S02E13

Arrow S04E13

Legends of Tomorrow S01E04

The Flash S02E14

Arrow S04E14

Legends of Tomorrow S01E05

Supergirl S01E14

The Flash S02E15

Arrow S04E15

Legends of Tomorrow S01E06

Supergirl S01E15

Legends of Tomorrow S01E07

Legends of Tomorrow S01E08

Supergirl S01E16

Supergirl S01E17

The Flash S02E16

Arrow S04E16

Supergirl S01E18

The Flash S02E17

Arrow S04E17

Legends of Tomorrow S01E09

Arrow S04E18

Legends of Tomorrow S01E10

Supergirl S01E19

Legends of Tomorrow S01E11

Supergirl S01E20

The Flash S02E18

Legends of Tomorrow S01E12

The Flash S02E19

Arrow S04E19

Legends of Tomorrow S01E13

The Flash S02E20

Arrow S04E20

Legends of Tomorrow S01E14

The Flash S02E21

Arrow S04E21

Legends of Tomorrow S01E15

The Flash S02E22

Arrow S04E22

Legends of Tomorrow S01E16

The Flash S02E23

Arrow S04E23

The Flash S03E01

Arrow S05E01

Supergirl S02E01

The Flash S03E02

Arrow S05E02

Legends of Tomorrow S02E01

Supergirl S02E02

The Flash S03E03

Arrow S05E03

Legends of Tomorrow S02E02

Supergirl S02E03

The Flash S03E04

Arrow S05E04

Legends of Tomorrow S02E03

Supergirl S02E04

The Flash S03E05

Arrow S05E05

Legends of Tomorrow S02E04

Supergirl S02E05

Arrow S05E06

Legends of Tomorrow S02E05

Supergirl S02E06

The Flash S03E06

Arrow S05E07

Legends of Tomorrow S02E06

Supergirl S02E07

The Flash S03E07

Supergirl S02E08

The Flash S03E08

Arrow S05E08

Legends of Tomorrow S02E07

The Flash S03E09

Arrow S05E09

Legends of Tomorrow S02E08

Supergirl S02E09

The Flash S03E10

Legends of Tomorrow S02E09

Arrow S05E10

Supergirl S02E10

The Flash S03E11

Legends of Tomorrow S02E10

Arrow S05E11

Supergirl S02E11

The Flash S03E12

Legends of Tomorrow S02E11

Arrow S05E12

Supergirl S02E12

Arrow S05E13

Supergirl S02E13

The Flash S03E13

Legends of Tomorrow S02E12

Arrow S05E14

Supergirl S02E14

The Flash S03E14

Arrow S05E15

Supergirl S02E15

The Flash S03E15

Legends of Tomorrow S02E13

The Flash S03E16

Legends of Tomorrow S02E14

Arrow S05E16

Supergirl S02E16

The Flash S03E17

Legends of Tomorrow S02E15

Arrow S05E17

Supergirl S02E17

The Flash S03E18

Legends of Tomorrow S02E16

Arrow S05E18

Legends of Tomorrow S02E17

Supergirl S02E18

The Flash S03E19

Arrow S05E19

Supergirl S02E19

The Flash S03E20

Arrow S05E20

Supergirl S02E20

The Flash S03E21

Arrow S05E21

Supergirl S02E21

The Flash S03E22

Arrow S05E22

Supergirl S02E22

The Flash S03E23

Arrow S05E23

Supergirl S03E01

The Flash S04E01

Legends of Tomorrow S03E01

Arrow S06E01

Supergirl S03E02

The Flash S04E02

Legends of Tomorrow S03E02

Arrow S06E02

Supergirl S03E03

The Flash S04E03

Legends of Tomorrow S03E03

Arrow S06E03

Supergirl S03E04

The Flash S04E04

Legends of Tomorrow S03E04

Arrow S06E04

Supergirl S03E05

The Flash S04E05

Legends of Tomorrow S03E05

Arrow S06E05

Supergirl S03E06

The Flash S04E06

Legends of Tomorrow S03E06

Arrow S06E06

Supergirl S03E07

The Flash S04E07

Legends of Tomorrow S03E07

Arrow S06E07

Supergirl S03E08

Arrow S06E08

The Flash S04E08

Legends of Tomorrow S03E08

Supergirl S03E09

The Flash S04E09

Legends of Tomorrow S03E09

Arrow S06E09

Supergirl S03E10

The Flash S04E10

Black Lightning S01E01

Arrow S06E10

Supergirl S03E11

The Flash S04E11

Black Lightning S01E02

Arrow S06E11

Supergirl S03E12

The Flash S04E12

Black Lightning S01E03

Arrow S06E12

Supergirl S03E13

The Flash S04E13

Black Lightning S01E04

Arrow S06E13

Legends of Tomorrow S03E10

Black Lightning S01E05

Legends of Tomorrow S03E11

Legends of Tomorrow S03E12

The Flash S04E14

Black Lightning S01E06

Arrow S06E14

Legends of Tomorrow S03E13

The Flash S04E15

Black Lightning S01E07

Arrow S06E15

Legends of Tomorrow S03E14

The Flash S04E16

Black Lightning S01E08

Legends of Tomorrow S03E15

Black Lightning S01E09

Legends of Tomorrow S03E16

Black Lightning S01E10

Arrow S06E16

Legends of Tomorrow S03E17

Black Lightning S01E11

Arrow S06E17

Legends of Tomorrow S03E18

The Flash S04E17

Black Lightning S01E12

Arrow S06E18

Supergirl S03E14

The Flash S04E18

Black Lightning S01E13

Arrow S06E19

Supergirl S03E15

The Flash S04E19

Arrow S06E20

Supergirl S03E16

The Flash S04E20

Arrow S06E21

Supergirl S03E17

The Flash S04E21

Arrow S06E22

Supergirl S03E18

The Flash S04E22

Arrow S06E23

Supergirl S03E19

The Flash S04E23

Supergirl S03E20

Supergirl S03E21

Supergirl S03E22

Supergirl S03E23

The Flash S05E01

Black Lightning S02E01

Supergirl S04E01

Arrow S07E01

The Flash S05E02

Black Lightning S02E02

Supergirl S04E02

Arrow S07E02

Legends of Tomorrow S04E01

The Flash S05E03

Black Lightning S02E03

Supergirl S04E03

Arrow S07E03

Legends of Tomorrow S04E02

The Flash S05E04

Black Lightning S02E04

Supergirl S04E04

Arrow S07E04

Legends of Tomorrow S04E03

Supergirl S04E05

Arrow S07E05

Legends of Tomorrow S04E04

The Flash S05E05

Black Lightning S02E05

Supergirl S04E06

Arrow S07E06

Legends of Tomorrow S04E05

The Flash S05E06

Black Lightning S02E06

Supergirl S04E07

Arrow S07E07

Legends of Tomorrow S04E06

The Flash S05E07

Black Lightning S02E07

Supergirl S04E08

Arrow S07E08

DC's Legends of Tomorrow S04E07

The Flash S05E08

Black Lightning S02E08

The Flash S05E09

Arrow S07E09

Legends of Tomorrow S04E08

Black Lightning S02E09

Supergirl S04E09

The Flash S05E10

Supergirl S04E10

Arrow S07E10

Black Lightning S02E10

The Flash S05E11

Arrow S07E11

Legends of Tomorrow S04E09