error 0
 ==26855== Memcheck, a memory error detector
 ==26855== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
 ==26855== Using Valgrind-3.15.0.GIT and LibVEX; rerun with -h for copyright info
 ==26855== Command: ./try
 ==26855==
 Alarm clock
 ==26855==
 ==26855== Process terminating with default action of signal 15 (SIGTERM)
 ==26855==    at 0x4039E4: minmax (controlbits.c:71)
 ==26855==    by 0x4039B1: merge (controlbits.c:94)
 ==26855==    by 0x40396F: merge (controlbits.c:91)
 ==26855==    by 0x40396F: merge (controlbits.c:91)
 ==26855==    by 0x403902: sort (controlbits.c:118)
 ==26855==    by 0x4037FE: composeinv (controlbits.c:141)
 ==26855==    by 0x4033C9: controlbitsfrompermutation (controlbits.c:210)
 ==26855==    by 0x4036D9: controlbitsfrompermutation (controlbits.c:242)
 ==26855==    by 0x4036D9: controlbitsfrompermutation (controlbits.c:242)
 ==26855==    by 0x4036D9: controlbitsfrompermutation (controlbits.c:242)
 ==26855==    by 0x4031A0: controlbits (controlbits.c:255)
 ==26855==    by 0x402680: sk_part_gen (sk_gen.c:138)
 ==26855==
 ==26855== HEAP SUMMARY:
 ==26855==     in use at exit: 13,580,800 bytes in 10 blocks
 ==26855==   total heap usage: 15 allocs, 5 frees, 13,590,648 bytes allocated
 ==26855==