What is the number of stereoisomers that the complex ion [Co(H2NCH2CH2NH2)2Cl2]+[\text{Co}(\text{H}_2\text{NCH}_2\text{CH}_2\text{NH}_2)_2\text{Cl}_2]^+[Co(H2NCH2CH2NH2)2Cl2]+ can form?
222
333
444
666