Is it necessary to buy A2A tokens after purchasing STE?

No, you don't have to buy A2A tokens after you have purchased STE tokens. These tokens have different tasks and you are not obligated to buy one after you have purchased another. 

It looks like you don't entirely understand how A2A and STE tokens really work if you have such question. We recommend to read more information about them at our website.

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    STE and A2A tokens ICOs are finished. The exchange is now open for trading.

    50X / ETH 2.414E-5 40.19 %
    A2A / ETH 6.56E-6 24.89 %