x = malloc(4)
y = malloc(10)
m = malloc(5)
z = malloc(4)
n = malloc(2)
w = malloc(12)
o = malloc(8)
a = malloc(4)
p = malloc(4)
b = malloc(10)
q = malloc(8)
c = malloc(2)
free(m);
free(n);
free(o);
free(p);
free(q);

freelist[0]: 0 = address of first free size 8 chunk
freelist[1]: 60 = address of first free size 12 chunk
freelist[2]: -1 = there are no free size 16 chunks
freelist[3]: -1 = there are no free size 20 chunks
   .
   .
   .
freelist[217]: -1 = there are no free size 876 chunks
freelist[218]: 120 = address of first free size 880 chunk
freelist[219]: -1 = there are no free size 884 chunks
   .
   .
   .
freelist[10000]: -1 = there are no free size 40004 chunks
freelist[10001]: -1 = there are no free chunks bigger than 40004 words

12121212 = the special pattern that marks an "in use" chunk
98989898 = the special pattern that marks a free chunk.

                             ________________________
  heap[0]: 8 = size of chunk
  heap[1]: 12121212 = "used"
  heap[2]: x
  heap[3]: x
  heap[4]: x
  heap[5]: x
  heap[6]: x
  heap[7]: 8 = size of chunk  _______________________
  heap[8]: 12 = size of chunk
  heap[9]: 12121212 = "used"
 heap[10]: y
 heap[11]: y
 heap[12]: y
 heap[13]: y
 heap[14]: y
 heap[15]: y
 heap[16]: y
 heap[17]: y
 heap[18]: y
 heap[19]: 12 = size of chunk _______________________
 heap[20]: 8 = size of chunk
 heap[21]: 98989898 = "free"
 heap[22]: 36 = address of next size 8 free chunk
 heap[23]: 0 = address of previous size 8 free chunk
 heap[24]: -
 heap[25]: -
 heap[26]: -
 heap[27]: 8 = size of chunk ________________________
 heap[28]: 8 = size of chunk
 heap[29]: 12121212 = "used"
 heap[30]: z
 heap[31]: z
 heap[32]: z
 heap[33]: z
 heap[34]: z
 heap[35]: 8 = size of chunk ________________________
 heap[36]: 8 = size of chunk
 heap[37]: 98989898 = "free"
 heap[38]: 80 = address of next size 8 free chunk
 heap[39]: 20 = address of previous size 8 free chunk
 heap[40]: -
 heap[41]: -
 heap[42]: -
 heap[43]: 8 = size of chunk ________________________
 heap[44]: 16 = size of chunk
 heap[45]: 12121212 = "used"
 heap[46]: w
 heap[47]: w
 heap[48]: w
 heap[49]: w
 heap[50]: w
 heap[51]: w
 heap[52]: w
 heap[53]: w
 heap[54]: w
 heap[55]: w
 heap[56]: w
 heap[57]: w
 heap[58]: w
 heap[59]: 16 = size of chunk ________________________
 heap[60]: 12 = size of chunk
 heap[61]: 98989898 = "free"
 heap[62]: 100 = address of next size 12 free chunk
 heap[63]: 0 = address of previous size 12 free chunk
 heap[64]: -
 heap[65]: -
 heap[66]: -
 heap[67]: -
 heap[68]: -
 heap[69]: -
 heap[70]: -
 heap[71]: 12 = size of chunk _______________________
 heap[72]: 8 = size of chunk
 heap[73]: 12121212 = "used"
 heap[74]: a
 heap[75]: a
 heap[76]: a
 heap[77]: a
 heap[78]: a
 heap[79]: 8 = size of chunk _______________________
 heap[80]: 8 = size of chunk
 heap[81]: 98989898 = "free"
 heap[82]: 0 = no next size 8 free chunk
 heap[83]: 36 = address of previous size 8 free chunk
 heap[84]: -
 heap[85]: -
 heap[86]: -
 heap[87]: 8 = size of chunk _______________________
 heap[88]: 12 = size of chunk
 heap[89]: 12121212 = "used"
 heap[90]: b
 heap[91]: b
 heap[92]: b
 heap[93]: b
 heap[94]: b
 heap[95]: b
 heap[96]: b
 heap[97]: b
 heap[98]: b
 heap[99]: 12 = size of chunk _____________________
heap[100]: 12 = size of chunk
heap[101]: 98989898 = "free"
heap[102]: 0 = no next size 12 free chunk
heap[103]: 60 = address of previous size 12 chunk
heap[104]: -
heap[105]: -
heap[106]: -
heap[107]: -
heap[108]: -
heap[109]: -
heap[110]: -
heap[111]: 12 = size of chunk ____________________
heap[112]: 8 = size of chunk
heap[113]: 12121212 = "used"
heap[114]: c
heap[115]: c
heap[116]: c
heap[117]: c
heap[118]: c
heap[119]: 8 = size of chunk _____________________
heap[120]: 880 = size of chunk
heap[121]: 98989898 = "free"
heap[122]: 0 = no next size 880 free chunk
heap[123]: 0 = no previous size 880 free chunk
heap[124]: -
heap[125]: -
heap[126]: -
heap[127]: -
heap[128]: -
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heap[999]: 880 = size of chunk _______________