Among  ${\text{H}}_{\text{2}}{\text{,\hspace{0.17em}O}}_{\text{2}}{\text{,\hspace{0.17em}N}}_{\text{2}}{\text{O}}_{\text{2}}^{\text{+}}{\text{,\hspace{0.17em}O}}_{\text{2}}^{\text{-}}{\text{,\hspace{0.17em}B}}_{\text{2}}{\text{,\hspace{0.17em}\hspace{0.17em}F}}_{\text{2}}{\text{,\hspace{0.17em}\hspace{0.17em}C}}_{\text{2}}$and ${\text{N}}_{\text{2}}^{\text{+}}$, the number of diamagnetic species is /are___

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