a contraceptive implant an oral contraceptive** (with additional barrier method) OR Must be on a stable dose of the same oral hormonal contraceptive product for at least 4 weeks before dosing with study drug and for the duration of the study Use an approved contraceptive method. Women of childbearing potential (WCBP) must have a negative serum or urine pregnancy test within 7 days of starting study drug; in addition, sexually active WCBP must agree to use adequate contraceptive methods (oral, injectable, or implantable hormonal contraceptive; tubal ligation; intra-uterine device; or barrier contraceptive with spermicide) while on study drug; WCBP must agree to have pregnancy tests every 4 weeks while on study drug Women of childbearing potential (WOCBP) and men must agree to use effective contraceptive methods from Screening throughout the study treatment period and until at least 90 days after the last dose of either ipilimumab or IMO-2125, whichever is later. Women of childbearing potential who are on stable oral contraceptive therapy or intrauterine or implant device for at least 90 days prior to the study, or abstain from sexual intercourse as a way of living Patient and his/her partner agree to use adequate contraception after providing written informed consent through 3 months after the last dose of TVB-2640, as follows:\r\n* For women: Compliant with a medically-approved contraceptive regimen during and for 3 months after the treatment period or documented to be surgically sterile or postmenopausal\r\n* For men: Compliant with a medically-approved contraceptive regimen during and for 3 months after the treatment period or documented to be surgically sterile; men whose sexual partners are of child-bearing potential must agree to use 2 methods of contraception prior to study entry, during the study, and for 3 months after the treatment period For women of childbearing potential: abstinent or use an effective form of contraceptive method for at least 3 months for cobimetinib and at least 5 months for atezolizumab For men and women of child-producing potential, the use of effective contraceptive methods during the study Participants should agree to practice effective contraceptive precautions and to use at least one method of contraception for the duration of the study and for 3 months post-transplant If participant is of reproductive potential, must agree to use medically approved contraceptive precautions during the study and for six months following the last dose of study drug Established hormonal contraceptive methods: oral, injectable, or implant. Females who are using hormonal contraceptives must have been on a stable dose of the same hormonal contraceptive product for at least 4 weeks prior to dosing and must continue to use the same contraceptive during the study and for 30 days after study drug discontinuation. Female participants exempt from this requirement are participants who practice total abstinence or have a male partner who is vasectomized with confirmed azoospermia. If currently abstinent, the participant must agree to use a double barrier method as described above if they become sexually active during the Treatment Cycles, and for 30 days after study drug discontinuation Women and men of child-producing potential must agree to use effective contraceptive methods during the study period (including post-treatment observation period) Male or female not willing to use adequate contraceptive precautions during the study period. Females must either be surgically sterile, post-menopausal for 12 months, or use a contraceptive approved by sponsor. Males who have partners of childbearing potential must agree to use an effective contraceptive method during the study and for 6 months following the last dose of study drug Subject (male and female) of childbearing/reproductive potential must agree to use double-barrier contraceptive measures or avoid intercourse during the study and for 90 days after the last dose of study drug. Are using hormonal contraceptives but are not on a stable dose of the same hormonal contraceptive product for at least 4 weeks before dosing and who do not agree to use the same contraceptive during the study or for 28 days after study drug discontinuation. a contraceptive implant an oral contraceptive (with additional barrier method) (Note: Participants must be on a stable dose of the same oral hormonal contraceptive product for at least 4 weeks before dosing with study drug and for the duration of the study.) OR Males or females of reproductive potential may not participate unless they have agreed to use an effective contraceptive methods as follows: fertile females of childbearing potential who agree to use adequate contraceptive measures from 2 weeks prior to the study and until 1 month after study treatment discontinuation; male patients willing to abstain or use barrier contraception (i.e. condoms) for the duration of the study and for 3 months after treatment stops Females of child bearing potential and males with female partners must and use of contraceptive methods with a failure rate of less than or equal to (