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It is the "free" group of nilpotency class at most $2$, exponent dividing $4$, on three generators. (In other words, every group in that class is a quotient of it.)

According to

https://etd.ohiolink.edu/rws_etd/document/get/osu1086112148/inline

(ON SYLOW $2$-SUBGROUPS OF FINITE SIMPLE GROUPS OF ORDER UP TO $2^{10}$, Sergey Malyushitsky, M.S. Thesis, The Ohio State University)

  it is not the Sylow $2$-subgroup of a finite simple group.

In general, the "free" group of nilpotency class at most $2$ and exponent at most $4$ on $d$ generators has order $4^d\cdot 2^{\binom{d}{2}}$. So, for example, you should see a similar phenomena at order 32, where there is a unique group of rank $2$ and $p$-class $2$.

It is the "free" group of nilpotency class at most $2$, exponent dividing $4$, on three generators. (In other words, every group in that class is a quotient of it.)

According to Sergey Malyushitsky (On Sylow $2$-subgroups of Finite Simple Groups of Order up to $2^{10}$, M.S. Thesis, The Ohio State University), it is not the Sylow $2$-subgroup of a finite simple group.
In general, the "free" group of nilpotency class at most $2$ and exponent at most $4$ on $d$ generators has order $4^d\cdot 2^{\binom{d}{2}}$. So, for example, you should see a similar phenomena at order 32, where there is a unique group of rank $2$ and $p$-class $2$.

It is the "free" group of nilpotency class at most $2$, exponent at most $4$, on three generators. (In other words, every group in that class is a quotient of it.)

According to

https://etd.ohiolink.edu/rws_etd/document/get/osu1086112148/inline

(ON SYLOW $2$-SUBGROUPS OF FINITE SIMPLE GROUPS OF ORDER UP TO $2^{10}$, Sergey Malyushitsky, M.S. Thesis, The Ohio State University)

it is not the Sylow $2$-subgroup of a finite simple group.

In general, the "free" group of nilpotency class at most $2$ and exponent at most $4$ on $d$ generators has order $4^d\cdot 2^{\binom{d}{2}}$. So, for example, you should see a similar phenomena at order 32, where there is a unique group of rank $2$ and $p$-class $2$.

It is the "free" group of nilpotency class at most $2$, exponent dividing $4$, on three generators. (In other words, every group in that class is a quotient of it.)

According to

https://etd.ohiolink.edu/rws_etd/document/get/osu1086112148/inline

(ON SYLOW $2$-SUBGROUPS OF FINITE SIMPLE GROUPS OF ORDER UP TO $2^{10}$, Sergey Malyushitsky, M.S. Thesis, The Ohio State University)

it is not the Sylow $2$-subgroup of a finite simple group.

In general, the "free" group of nilpotency class at most $2$ and exponent at most $4$ on $d$ generators has order $4^d\cdot 2^{\binom{d}{2}}$. So, for example, you should see a similar phenomena at order 32, where there is a unique group of rank $2$ and $p$-class $2$.

It is the "free" group of nilpotency class at most 2, exponent at most 4, on three generators. (In other words, every group in that class is a quotient of it.)

According to

https://etd.ohiolink.edu/rws_etd/document/get/osu1086112148/inline

(ON SYLOW 2-SUBGROUPS OF FINITE SIMPLE GROUPS OF ORDER UP TO 2^10, Sergey Malyushitsky, M.S. Thesis, The Ohio State University)

it is not the Sylow 2-subgroup of a finite simple group.

In general, the "free" group of nilpotency class at most 2 and exponent at most 4 on d generators has order $4^d\cdot 2^{\binom{d}{2}}$. So, for example, you should see a similar phenomena at order 32, where there is a unique group of rank 2 and $p$-class $2$.

It is the "free" group of nilpotency class at most $2$, exponent at most $4$, on three generators. (In other words, every group in that class is a quotient of it.)

According to

https://etd.ohiolink.edu/rws_etd/document/get/osu1086112148/inline

(ON SYLOW $2$-SUBGROUPS OF FINITE SIMPLE GROUPS OF ORDER UP TO $2^{10}$, Sergey Malyushitsky, M.S. Thesis, The Ohio State University)

it is not the Sylow $2$-subgroup of a finite simple group.

In general, the "free" group of nilpotency class at most $2$ and exponent at most $4$ on $d$ generators has order $4^d\cdot 2^{\binom{d}{2}}$. So, for example, you should see a similar phenomena at order 32, where there is a unique group of rank $2$ and $p$-class $2$.