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extern void srand48(long seed);
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extern unsigned short *seed48(unsigned short xseed[3]);
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extern long nrand48(unsigned short xseed[3]);
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extern long mrand48(void);
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extern long lrand48(void);
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extern void lcong48(unsigned short p[7]);
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extern long jrand48(unsigned short xseed[3]);
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extern double erand48(unsigned short xseed[3]);
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extern double drand48(void);