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< SECP256K1_API secp256k1_context* secp256k1_context_create(
<     unsigned int flags
< ) SECP256K1_WARN_UNUSED_RESULT;
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< SECP256K1_API secp256k1_context* secp256k1_context_clone(
<     const secp256k1_context* ctx
< ) SECP256K1_ARG_NONNULL(1) SECP256K1_WARN_UNUSED_RESULT;
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< SECP256K1_API void secp256k1_context_destroy(
<     secp256k1_context* ctx
< );
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< SECP256K1_API SECP256K1_WARN_UNUSED_RESULT secp256k1_scratch_space* secp256k1_scratch_space_create(
<     const secp256k1_context* ctx,
<     size_t size
< ) SECP256K1_ARG_NONNULL(1);
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< SECP256K1_API void secp256k1_scratch_space_destroy(
<     const secp256k1_context* ctx,
<     secp256k1_scratch_space* scratch
< ) SECP256K1_ARG_NONNULL(1);